python/TangDou/XiTi/1245.cpp

#include <bits/stdc++.h>

using namespace std;

const double eps = 1e-8;

int main() {
    //思路1
    for (int i = 1; i <= 150; i++) { //枚举数学与外语的成绩
        for (int j = 1; j <= 150; j++) {
            double p = 1.0 * (78 + 82 + 80 + 62 + 83 + i + j) / 7;
            if (abs(i - 12 - p) < eps && abs(j - 8 - p) < eps) {
                cout << p << endl;
                break;
            }
        }
    }

    //思路2
    //画图说明曲线问题，会很好理解
    int a[] = {78, 82, 80, 62, 83};
    for (int i = 1; i <= 150; i++) { //枚举平均分
        int c = 0;
        for (int j = 0; j < 5; j++) c += a[j] - i; //计算每科分数与平均分的差，再求和
        c += 12;
        c += 8;
        if (c == 0) {
            cout << i << endl;
            break;
        }
    }
    return 0;
}