题解 | #学分绩点#

#include <stdio.h>
//成绩对应学分
float getGPA(int x){
    if (x>=90)  return 4.0;
    else if(x >= 85)    return 3.7;
    else if(x >= 82)    return 3.3;
    else if(x >= 78)    return 3.0;
    else if(x >= 75)    return 2.7;
    else if(x >= 72)    return 2.3;
    else if(x >= 68)    return 2.0;
    else if(x >= 64)    return 1.5;
    else if(x >= 60)    return 1.0;
    else    return 0;
}

int main(){
    //输入
    int num;
    scanf("%d", &num);
    int score[num];
    for (int i = 0; i < num; ++i) {
        scanf("%d", &score[i]);
    }
    int  grade[num];
    for (int i = 0; i < num; ++i) {
        scanf("%d", &grade[i]);
    }
    //计算
    float mark = 0;
    int sumScore = 0;
    for (int i = 0; i < num; ++i) {
        mark += score[i] * getGPA(grade[i]);
        sumScore += score[i];
    }
    float GPA = mark / sumScore;
    printf("%.2f\n",GPA);
    return 0;
}