diff --git a/examples/aplusb/buildtests b/examples/aplusb/buildtests
index aeaccf5..c54ff74 100755
--- a/examples/aplusb/buildtests
+++ b/examples/aplusb/buildtests
@@ -53,18 +53,7 @@ cat testmanifest | while read instr; do
         #################
 
         if [ $rebuild_inputs = true ] ; then
-            # Build input generator
-            cd ingen && make -s && cd ..
-
-            # Copy ingen/ingen.bin and incf/$1 into stage
-            cp ingen/ingen.bin stage/$problemname.bin
-            cp incf/$incf stage/$problemname.cf
-
-            # Build input
-            cd stage && ./$problemname.bin && cp $problemname.in ../tests/$problemname-$nr.in && cd ..
-
-            # Clean stage
-            rm stage/*
+            build_test_number $nr $incf
         fi
 
         ###################
diff --git a/examples/aplusb/compare b/examples/aplusb/compare
new file mode 100755
index 0000000..6a81689
--- /dev/null
+++ b/examples/aplusb/compare
@@ -0,0 +1,90 @@
+#!/bin/bash
+#
+# compare -s "s1 s2" -s s3 -c "c1 c2" -c c3 compares sources s1, s2, s3 with configurations c1 c2 c3 until they diverge
+# Tamio-Vesa Nakajima
+
+source lib
+source problemconfig
+
+srcs=""
+configs=""
+
+while getopts "hs:c:" opt ; do
+    case $opt in
+        h)
+            echo "Usage: ./compare -s \"source1\" -s \"source2\" -c \"config1\" \"config2\""
+            exit 0
+            ;;
+        s)
+            srcs="$srcs $OPTARG"
+            ;;
+        c)
+            configs="$configs $OPTARG"
+            ;;
+    esac
+done
+
+if [ -z "$srcs" ] ; then
+    echo No sources provided
+    exit 1
+fi
+
+if [ -z "$configs" ] ; then
+    echo No configs provided
+    exit 1
+fi
+
+srcs_arr=($srcs)
+nr_srcs=${#srcs_arr[@]}
+outputs_arr=()
+binary_arr=()
+input_file=`mktemp`
+
+for i in `seq 0 $(($nr_srcs-1))` ; do
+    outputs_arr[$i]=`mktemp`
+    binary_arr[$i]=`mktemp`
+done
+
+for i in `seq 0 $(($nr_srcs-1))` ; do
+    g++ src/${srcs_arr[$i]} -std=c++11 -O2 -o ${binary_arr[$i]}
+done
+
+curr_test=0
+
+path_to_tests=`realpath tests`
+trap "rm $path_to_tests/$problemname-999.in" EXIT
+
+while : ; do
+    for conf in $configs ; do
+        rm stage/* 2> /dev/null
+        echo -en "                        \r"
+        echo Doing test $curr_test
+        curr_test=$(($curr_test + 1))
+
+        build_test_number 999 $conf
+
+        hasTle=false
+
+        for i in `seq 0 $(($nr_srcs-1))` ; do
+            run_src_test ${binary_arr[$i]} $problemname-999
+
+            if (( $(echo "$timeUsed > $timelimit" | bc -l ) )) ; then
+                hasTle=true
+            fi
+
+            cp stage/$problemname.out ${outputs_arr[$i]}
+        done
+        if [ $hasTle = true ] || ! diff --from-file ${outputs_arr[*]} > /dev/null ; then
+            echo -en "                           \r"
+            echo Has failed on:
+            cat tests/$problemname-999.in
+            echo With outputs:
+            for i in `seq 0 $(($nr_srcs-1))` ; do
+                echo ${srcs_arr[$i]}:
+                cat ${outputs_arr[$i]}
+                echo
+            done
+            exit 0
+        fi
+    done
+done
diff --git a/examples/aplusb/incf/fixed b/examples/aplusb/incf/fixed
index 1a63220..4271727 100644
--- a/examples/aplusb/incf/fixed
+++ b/examples/aplusb/incf/fixed
@@ -1 +1 @@
-1 0 2
+1 0 0
diff --git a/examples/aplusb/incf/fixed2 b/examples/aplusb/incf/fixed2
new file mode 100644
index 0000000..8cd5e6d
--- /dev/null
+++ b/examples/aplusb/incf/fixed2
@@ -0,0 +1 @@
+1 100 200
diff --git a/examples/aplusb/ingen/ingen.bin b/examples/aplusb/ingen/ingen.bin
index 83566ce..40aa67d 100755
Binary files a/examples/aplusb/ingen/ingen.bin and b/examples/aplusb/ingen/ingen.bin differ
diff --git a/examples/aplusb/ingen/ingen.cpp b/examples/aplusb/ingen/ingen.cpp
index c661e9b..223d9c2 100644
--- a/examples/aplusb/ingen/ingen.cpp
+++ b/examples/aplusb/ingen/ingen.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <fstream>
+#include <chrono>
 using namespace std;
 
 int main(){
@@ -8,12 +9,12 @@ int main(){
     bool fixed;
     int x, y;
     f >> fixed >> x >> y;
-    cout << fixed << ' ' << x << ' ' << y << endl;
 
     if(fixed){
         g << x << ' ' << y << endl;
     }
     else{
-        srand(time(nullptr));
+        unsigned seed1 = std::chrono::system_clock::now().time_since_epoch().count();
+        srand(seed1);
         g << rand() << ' ' << rand() << endl; }
     return 0; }
diff --git a/examples/aplusb/lib b/examples/aplusb/lib
index d9526ac..e8bf9c7 100644
--- a/examples/aplusb/lib
+++ b/examples/aplusb/lib
@@ -23,6 +23,28 @@ maybecp () {
     fi
 }
 
+# Builds test number $1 with incf $2
+build_test_number () {
+    source problemconfig
+
+    nr=$1
+    incf=$2
+
+    # Build input generator
+    cd ingen && make -s && cd ..
+
+    # Copy ingen/ingen.bin and incf/$1 into stage
+    cp ingen/ingen.bin stage/$problemname.bin
+    cp incf/$incf stage/$problemname.cf
+
+    # Build input
+    cd stage && ./$problemname.bin && cp $problemname.in ../tests/$problemname-$nr.in && cd ..
+
+    # Clean stage
+    rm stage/* 2> /dev/null
+
+}
+
 # Run the binary $1 with test $2, returning the time used in timeUsed, and leaving the output file in stage/$problemname.out
 run_src_test () {
     binary=$1
@@ -45,7 +67,7 @@ run_src_test () {
     echo -en "Doing $testname\r"
 
     # Clean the stage
-    rm stage/*
+    rm stage/* 2> /dev/null
 
     # Copy the binary into the stage
     cp $binary stage/$problemname.bin
diff --git a/examples/aplusb/oldtests/newtests.zip b/examples/aplusb/oldtests/newtests.zip
new file mode 100644
index 0000000..c8cb9ae
Binary files /dev/null and b/examples/aplusb/oldtests/newtests.zip differ
diff --git a/examples/aplusb/oldtests/newtests2.zip b/examples/aplusb/oldtests/newtests2.zip
new file mode 100644
index 0000000..9756376
Binary files /dev/null and b/examples/aplusb/oldtests/newtests2.zip differ
diff --git a/examples/aplusb/src/almost_ok.cpp b/examples/aplusb/src/almost_ok.cpp
new file mode 100644
index 0000000..9464e09
--- /dev/null
+++ b/examples/aplusb/src/almost_ok.cpp
@@ -0,0 +1,11 @@
+#include <fstream>
+using namespace std;
+
+int main(){
+    ifstream f("aplusb.in");
+    ofstream g("aplusb.out");
+    long long x, y;
+    f >> x >> y;
+    if((x+y)%100 == 0) g << -1 << endl;
+    else g << x+y << endl;
+    return 0; }
diff --git a/examples/aplusb/stage/aplusb.bin b/examples/aplusb/stage/aplusb.bin
new file mode 100755
index 0000000..51e0c25
Binary files /dev/null and b/examples/aplusb/stage/aplusb.bin differ
diff --git a/examples/aplusb/stage/aplusb.in b/examples/aplusb/stage/aplusb.in
new file mode 100644
index 0000000..ac00f99
--- /dev/null
+++ b/examples/aplusb/stage/aplusb.in
@@ -0,0 +1 @@
+468168176 122451424
diff --git a/examples/aplusb/stage/aplusb.out b/examples/aplusb/stage/aplusb.out
new file mode 100644
index 0000000..3a2e3f4
--- /dev/null
+++ b/examples/aplusb/stage/aplusb.out
@@ -0,0 +1 @@
+-1
diff --git a/examples/aplusb/testmanifest b/examples/aplusb/testmanifest
index 83d2d86..9e68729 100644
--- a/examples/aplusb/testmanifest
+++ b/examples/aplusb/testmanifest
@@ -1,2 +1,3 @@
 1 fixed 10
+1 fixed2 10
 18 random 90
diff --git a/examples/aplusb/tests/aplusb-1.in b/examples/aplusb/tests/aplusb-1.in
index a0718a1..10ec153 100644
--- a/examples/aplusb/tests/aplusb-1.in
+++ b/examples/aplusb/tests/aplusb-1.in
@@ -1 +1 @@
-1394068970 1070590020
+100 200
diff --git a/examples/aplusb/tests/aplusb-1.ok b/examples/aplusb/tests/aplusb-1.ok
index 98ce6b8..222b847 100644
--- a/examples/aplusb/tests/aplusb-1.ok
+++ b/examples/aplusb/tests/aplusb-1.ok
@@ -1,2 +1,2 @@
-5
-2464658990
+10
+300
diff --git a/examples/aplusb/tests/aplusb-10.in b/examples/aplusb/tests/aplusb-10.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-10.in
+++ b/examples/aplusb/tests/aplusb-10.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-10.ok b/examples/aplusb/tests/aplusb-10.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-10.ok
+++ b/examples/aplusb/tests/aplusb-10.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-11.in b/examples/aplusb/tests/aplusb-11.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-11.in
+++ b/examples/aplusb/tests/aplusb-11.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-11.ok b/examples/aplusb/tests/aplusb-11.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-11.ok
+++ b/examples/aplusb/tests/aplusb-11.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-12.in b/examples/aplusb/tests/aplusb-12.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-12.in
+++ b/examples/aplusb/tests/aplusb-12.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-12.ok b/examples/aplusb/tests/aplusb-12.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-12.ok
+++ b/examples/aplusb/tests/aplusb-12.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-13.in b/examples/aplusb/tests/aplusb-13.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-13.in
+++ b/examples/aplusb/tests/aplusb-13.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-13.ok b/examples/aplusb/tests/aplusb-13.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-13.ok
+++ b/examples/aplusb/tests/aplusb-13.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-14.in b/examples/aplusb/tests/aplusb-14.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-14.in
+++ b/examples/aplusb/tests/aplusb-14.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-14.ok b/examples/aplusb/tests/aplusb-14.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-14.ok
+++ b/examples/aplusb/tests/aplusb-14.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-15.in b/examples/aplusb/tests/aplusb-15.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-15.in
+++ b/examples/aplusb/tests/aplusb-15.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-15.ok b/examples/aplusb/tests/aplusb-15.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-15.ok
+++ b/examples/aplusb/tests/aplusb-15.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-16.in b/examples/aplusb/tests/aplusb-16.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-16.in
+++ b/examples/aplusb/tests/aplusb-16.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-16.ok b/examples/aplusb/tests/aplusb-16.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-16.ok
+++ b/examples/aplusb/tests/aplusb-16.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-17.in b/examples/aplusb/tests/aplusb-17.in
index 7a8f027..32ce837 100644
--- a/examples/aplusb/tests/aplusb-17.in
+++ b/examples/aplusb/tests/aplusb-17.in
@@ -1 +1 @@
-1394085777 1353065269
+1405884291 2082194543
diff --git a/examples/aplusb/tests/aplusb-17.ok b/examples/aplusb/tests/aplusb-17.ok
index cece230..275004c 100644
--- a/examples/aplusb/tests/aplusb-17.ok
+++ b/examples/aplusb/tests/aplusb-17.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3488078834
diff --git a/examples/aplusb/tests/aplusb-18.in b/examples/aplusb/tests/aplusb-18.in
index 7a8f027..ca06237 100644
--- a/examples/aplusb/tests/aplusb-18.in
+++ b/examples/aplusb/tests/aplusb-18.in
@@ -1 +1 @@
-1394085777 1353065269
+1405901098 217186145
diff --git a/examples/aplusb/tests/aplusb-18.ok b/examples/aplusb/tests/aplusb-18.ok
index cece230..9391515 100644
--- a/examples/aplusb/tests/aplusb-18.ok
+++ b/examples/aplusb/tests/aplusb-18.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+1623087243
diff --git a/examples/aplusb/tests/aplusb-19.in b/examples/aplusb/tests/aplusb-19.in
new file mode 100644
index 0000000..ca06237
--- /dev/null
+++ b/examples/aplusb/tests/aplusb-19.in
@@ -0,0 +1 @@
+1405901098 217186145
diff --git a/examples/aplusb/tests/aplusb-19.ok b/examples/aplusb/tests/aplusb-19.ok
new file mode 100644
index 0000000..9391515
--- /dev/null
+++ b/examples/aplusb/tests/aplusb-19.ok
@@ -0,0 +1,2 @@
+5
+1623087243
diff --git a/examples/aplusb/tests/aplusb-2.in b/examples/aplusb/tests/aplusb-2.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-2.in
+++ b/examples/aplusb/tests/aplusb-2.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-2.ok b/examples/aplusb/tests/aplusb-2.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-2.ok
+++ b/examples/aplusb/tests/aplusb-2.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-3.in b/examples/aplusb/tests/aplusb-3.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-3.in
+++ b/examples/aplusb/tests/aplusb-3.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-3.ok b/examples/aplusb/tests/aplusb-3.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-3.ok
+++ b/examples/aplusb/tests/aplusb-3.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-4.in b/examples/aplusb/tests/aplusb-4.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-4.in
+++ b/examples/aplusb/tests/aplusb-4.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-4.ok b/examples/aplusb/tests/aplusb-4.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-4.ok
+++ b/examples/aplusb/tests/aplusb-4.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-5.in b/examples/aplusb/tests/aplusb-5.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-5.in
+++ b/examples/aplusb/tests/aplusb-5.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-5.ok b/examples/aplusb/tests/aplusb-5.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-5.ok
+++ b/examples/aplusb/tests/aplusb-5.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-6.in b/examples/aplusb/tests/aplusb-6.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-6.in
+++ b/examples/aplusb/tests/aplusb-6.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-6.ok b/examples/aplusb/tests/aplusb-6.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-6.ok
+++ b/examples/aplusb/tests/aplusb-6.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-7.in b/examples/aplusb/tests/aplusb-7.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-7.in
+++ b/examples/aplusb/tests/aplusb-7.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-7.ok b/examples/aplusb/tests/aplusb-7.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-7.ok
+++ b/examples/aplusb/tests/aplusb-7.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-8.in b/examples/aplusb/tests/aplusb-8.in
index a0718a1..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-8.in
+++ b/examples/aplusb/tests/aplusb-8.in
@@ -1 +1 @@
-1394068970 1070590020
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-8.ok b/examples/aplusb/tests/aplusb-8.ok
index 98ce6b8..4919a58 100644
--- a/examples/aplusb/tests/aplusb-8.ok
+++ b/examples/aplusb/tests/aplusb-8.ok
@@ -1,2 +1,2 @@
 5
-2464658990
+3205586778
diff --git a/examples/aplusb/tests/aplusb-9.in b/examples/aplusb/tests/aplusb-9.in
index 7a8f027..3cb1cbe 100644
--- a/examples/aplusb/tests/aplusb-9.in
+++ b/examples/aplusb/tests/aplusb-9.in
@@ -1 +1 @@
-1394085777 1353065269
+1405867484 1799719294
diff --git a/examples/aplusb/tests/aplusb-9.ok b/examples/aplusb/tests/aplusb-9.ok
index cece230..4919a58 100644
--- a/examples/aplusb/tests/aplusb-9.ok
+++ b/examples/aplusb/tests/aplusb-9.ok
@@ -1,2 +1,2 @@
 5
-2747151046
+3205586778
diff --git a/src/buildtests b/src/buildtests
index aeaccf5..c54ff74 100755
--- a/src/buildtests
+++ b/src/buildtests
@@ -53,18 +53,7 @@ cat testmanifest | while read instr; do
         #################
 
         if [ $rebuild_inputs = true ] ; then
-            # Build input generator
-            cd ingen && make -s && cd ..
-
-            # Copy ingen/ingen.bin and incf/$1 into stage
-            cp ingen/ingen.bin stage/$problemname.bin
-            cp incf/$incf stage/$problemname.cf
-
-            # Build input
-            cd stage && ./$problemname.bin && cp $problemname.in ../tests/$problemname-$nr.in && cd ..
-
-            # Clean stage
-            rm stage/*
+            build_test_number $nr $incf
         fi
 
         ###################
diff --git a/src/compare b/src/compare
new file mode 100755
index 0000000..6a81689
--- /dev/null
+++ b/src/compare
@@ -0,0 +1,90 @@
+#!/bin/bash
+#
+# compare -s "s1 s2" -s s3 -c "c1 c2" -c c3 compares sources s1, s2, s3 with configurations c1 c2 c3 until they diverge
+# Tamio-Vesa Nakajima
+
+source lib
+source problemconfig
+
+srcs=""
+configs=""
+
+while getopts "hs:c:" opt ; do
+    case $opt in
+        h)
+            echo "Usage: ./compare -s \"source1\" -s \"source2\" -c \"config1\" \"config2\""
+            exit 0
+            ;;
+        s)
+            srcs="$srcs $OPTARG"
+            ;;
+        c)
+            configs="$configs $OPTARG"
+            ;;
+    esac
+done
+
+if [ -z "$srcs" ] ; then
+    echo No sources provided
+    exit 1
+fi
+
+if [ -z "$configs" ] ; then
+    echo No configs provided
+    exit 1
+fi
+
+srcs_arr=($srcs)
+nr_srcs=${#srcs_arr[@]}
+outputs_arr=()
+binary_arr=()
+input_file=`mktemp`
+
+for i in `seq 0 $(($nr_srcs-1))` ; do
+    outputs_arr[$i]=`mktemp`
+    binary_arr[$i]=`mktemp`
+done
+
+for i in `seq 0 $(($nr_srcs-1))` ; do
+    g++ src/${srcs_arr[$i]} -std=c++11 -O2 -o ${binary_arr[$i]}
+done
+
+curr_test=0
+
+path_to_tests=`realpath tests`
+trap "rm $path_to_tests/$problemname-999.in" EXIT
+
+while : ; do
+    for conf in $configs ; do
+        rm stage/* 2> /dev/null
+        echo -en "                        \r"
+        echo Doing test $curr_test
+        curr_test=$(($curr_test + 1))
+
+        build_test_number 999 $conf
+
+        hasTle=false
+
+        for i in `seq 0 $(($nr_srcs-1))` ; do
+            run_src_test ${binary_arr[$i]} $problemname-999
+
+            if (( $(echo "$timeUsed > $timelimit" | bc -l ) )) ; then
+                hasTle=true
+            fi
+
+            cp stage/$problemname.out ${outputs_arr[$i]}
+        done
+        if [ $hasTle = true ] || ! diff --from-file ${outputs_arr[*]} > /dev/null ; then
+            echo -en "                           \r"
+            echo Has failed on:
+            cat tests/$problemname-999.in
+            echo With outputs:
+            for i in `seq 0 $(($nr_srcs-1))` ; do
+                echo ${srcs_arr[$i]}:
+                cat ${outputs_arr[$i]}
+                echo
+            done
+            exit 0
+        fi
+    done
+done
diff --git a/src/lib b/src/lib
index d9526ac..e8bf9c7 100644
--- a/src/lib
+++ b/src/lib
@@ -23,6 +23,28 @@ maybecp () {
     fi
 }
 
+# Builds test number $1 with incf $2
+build_test_number () {
+    source problemconfig
+
+    nr=$1
+    incf=$2
+
+    # Build input generator
+    cd ingen && make -s && cd ..
+
+    # Copy ingen/ingen.bin and incf/$1 into stage
+    cp ingen/ingen.bin stage/$problemname.bin
+    cp incf/$incf stage/$problemname.cf
+
+    # Build input
+    cd stage && ./$problemname.bin && cp $problemname.in ../tests/$problemname-$nr.in && cd ..
+
+    # Clean stage
+    rm stage/* 2> /dev/null
+
+}
+
 # Run the binary $1 with test $2, returning the time used in timeUsed, and leaving the output file in stage/$problemname.out
 run_src_test () {
     binary=$1
@@ -45,7 +67,7 @@ run_src_test () {
     echo -en "Doing $testname\r"
 
     # Clean the stage
-    rm stage/*
+    rm stage/* 2> /dev/null
 
     # Copy the binary into the stage
     cp $binary stage/$problemname.bin