June18: stringstream processing [M]

learning stringstream, Time/Space: O(N)

daily/June18.cpp

@@ -0,0 +1,37 @@
+#include <bits/stdc++.h>
+
+#include <iomanip>
+#include <sstream>
+using namespace std;
+
+class Solution {
+ public:
+  /**
+   * @brief LC: 2288: Apply Discount to Prices
+   * Time: O(N), Space: O(N)
+   *
+   * @param sentence
+   * @param discount
+   * @return string
+   */
+  string discountPrices(string sentence, int discount) {
+    double d = 1 - discount / 100.0;
+    stringstream ss(sentence);
+    string ans, w;
+    while (ss >> w) {  // split and add to ans
+      if (!ans.empty()) {
+        ans += ' ';
+      }
+      if (w.length() > 1 && w[0] == '$' &&
+          all_of(w.begin() + 1, w.end(), ::isdigit)) {
+        stringstream s;
+        s << fixed << setprecision(2) << '$' << stoll(w.substr(1)) * d;
+        ans += s.str();
+      } else {
+        ans += w;
+      }
+    }
+
+    return ans;
+  }
+};