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1080B - Margarite and the best present.cpp
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1080B - Margarite and the best present.cpp
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#include<bits/stdc++.h>
#define endl '\n'
#define ll long long int
#define loop(i,a,b) for(ll i=a;i<=b;++i)
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define clr(x) x.clear()
#define MOD 1000000007
#define itoc(c) ((char)(((int)'0')+c))
#define vl vector<ll>
#define SZ(x) (x).size()
#define all(p) p.begin(),p.end()
#define mid(s,e) (s+(e-s)/2)
#define sv() ll t,n; scanf("%lld",&t);n=t; while(t--)
#define tcase() ll t,n; cin>>t;n=t; while(t--)
#define iscn(num) scanf("%d",&num);
#define scn(num) scanf("%lld ",&num);
#define debug(n) cout<<(n)<<endl;
using namespace std;
const ll INF = 2e18 + 99;
typedef pair<ll,ll> Pair;
typedef vector<ll> vec;
bool file=0,rt=1;
clock_t tStart ;
void FAST_IO();
////////////////////////
int main()
{
FAST_IO();
////////////////////////
ll n ; scn(n);
while(n--){
ll l, r; scn(l) ; scn(r);
ll total = (r*(r+1))/2 ;
ll temp = (l* (l-1))/2;
total-=temp ;
ll odd= r/2 ;
if(r&1)
odd++;
odd= odd*odd ;
odd-=((l/2)*(l/2));
odd*=2;
printf("%lld\n",total-odd);
}
////////////////////////
if(rt && file){
printf("\nTime taken: %.6fs", (double)(clock() - tStart)/CLOCKS_PER_SEC);
}
return 0;
}
void FAST_IO()
{
// ios_base::sync_with_stdio(0);
//cin.tie(NULL);
//cout.tie(NULL);
//cout.setf(ios::fixed);
//cout.precision(2);
if(rt && file){ tStart = clock(); }
if(file){
#ifndef _offline
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
}