Add 02755.cpp

02xxx/02755.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <iomanip>
+#include <string>
+#include <map>
+using namespace std;
+
+map<string, double> m = {
+  {"A+", 4.3}, {"A0", 4.0}, {"A-", 3.7},
+  {"B+", 3.3}, {"B0", 3.0}, {"B-", 2.7},
+  {"C+", 2.3}, {"C0", 2.0}, {"C-", 1.7},
+  {"D+", 1.3}, {"D0", 1.0}, {"D-", 0.7},
+  {"F", 0.0}
+};
+
+void solve(void) {
+  int n; cin >> n;
+
+  int credit = 0;
+  double sum = 0;
+  for (int i=0; i<n; i++) {
+    string a, c; int b; cin >> a >> b >> c;
+    sum += b * m[c];
+    credit += b;
+  }
+  sum += 1e-9;
+  cout << fixed << setprecision(2) << sum / credit;
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  solve();
+  return 0;
+}