Solved: password-hacking

password-hacking/Makefile

@@ -0,0 +1,11 @@
+EXE=a.out
+CC=g++
+CFLAGS=-lm -lcrypt -O2 -std=c++11 -Wall -Wextra -Werror -pipe -DONLINE_JUDGE
+OBJ=main.cpp
+
+$(EXE): $(OBJ)
+	$(CC) $(CFLAGS) -o $@ $(OBJ)
+
+.PHONY: clean
+clean:
+	rm -rf $(EXE)

password-hacking/main.cpp

@@ -0,0 +1,29 @@
+#include <vector>
+#include <algorithm>
+using std::vector;
+using std::sort;
+#include <cstdio>
+
+int main()
+{
+    int n;
+    scanf("%d\n", &n);
+    char c[256];
+    vector<double> pwds;
+    for (int i{0}; i < n; ++i) {
+        double p;
+        scanf("%s", c);
+        scanf("%lf\n", &p);
+        pwds.push_back(p);
+    }
+    sort(pwds.begin(), pwds.end());
+
+    double sum = 0;
+    int t = 1;
+    for (vector<double>::reverse_iterator i = pwds.rbegin(); i != pwds.rend(); ++i) {
+        sum += (double)t * (*i);
+        t++;
+    }
+
+    printf("%lf\n", sum);
+}