create dev channel

zeta/cpp/completed/25206.cpp

@@ -0,0 +1,52 @@
+#include<iostream>
+
+double convert_grade(const std::string &g);
+
+int main() {
+    double sum_of_score = 0;
+    double sum_of_prod_score_grade = 0;
+    for (int i = 0; i < 20; i++) {
+        std::string category;
+        double score;
+        std::string grade;
+        std::cin >> category >> score >> grade;
+        double s_grade = convert_grade(grade);
+        if (s_grade < 0) {
+            continue;
+        } else {
+            sum_of_score += score;
+            sum_of_prod_score_grade += score * s_grade;
+        }
+
+
+    }
+
+    std::cout << sum_of_prod_score_grade / sum_of_score;
+    return 0;
+}
+
+double convert_grade(const std::string &g) {
+    if (g == "A+") {
+        return 4.5;
+    } else if (g == "A0") {
+        return 4.0;
+    } else if (g == "B+") {
+        return 3.5;
+    } else if (g == "B0") {
+        return 3.0;
+    } else if (g == "C+") {
+        return 2.5;
+    } else if (g == "C0") {
+        return 2.0;
+    } else if (g == "D+") {
+        return 1.5;
+    } else if (g == "D0") {
+        return 1.0;
+    } else if (g == "F") {
+        return 0.0;
+    } else {
+        return -1.0;
+    }
+
+
+}