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这个，之前用的b去存储a的总和和排名，后来在比较的过程中，只改变的b的值，却没有改变a的值，但在比较语文成绩的时候用的还是a，这个时候a和b同样是第i个对应的可能不是同一个对象了

，因为上面b的值可能改变了，现在的第i个b可能是原来第i+1，i-1个，都有可能，所以比较结果错误。

#include<stdio.h>
#include<stdlib.h>int main()
{int n = 0;scanf("%d", &n);int(*a)[3] = (int*)malloc(sizeof(int) * 3 * n);int i = 0;int(*b)[2] = (int*)malloc(sizeof(int) * 2*n);for (i = 0; i < n; i++){scanf("%d %d %d", &a[i][0], &a[i][1], &a[i][2]);b[i][0] = a[i][0] + a[i][1] + a[i][2];b[i][1] = i+1;}for (i = 0; i < n; i++){int max = 0;int c = 0;for (int j = 0; j < n - 1 - i; j++){if (b[j][0] < b[j + 1][0]){max = b[j + 1][0];b[j + 1][0] = b[j][0];b[j][0] = max;c = b[j + 1][1];b[j + 1][1] = b[j][1];b[j][1] = c;}else if(b[j][0] == b[j + 1][0]){if (a[j][0] < a[j + 1][0]){c = b[j + 1][1];b[j + 1][1] = b[j][1];b[j][1] = c;}else if(a[j][0] == a[j + 1][0])if (b[j + 1][1] < b[j][1]){c = b[j + 1][1];b[j + 1][1] = b[j][1];b[j][1] = c;}}}}for (i = 0; i < 5; i++){printf("%d %d\n", b[i][1], b[i][0]);}free(a);a = NULL;free(b);b = NULL;return 0;
}

 这个是正确的，不过感觉这样还是很麻烦

#include<stdio.h>
#include<stdlib.h>
struct Stu
{int g[3];int sum;int n;
};
int main()
{int n = 0;scanf("%d", &n);struct Stu* a = (struct Stu*)malloc(sizeof(struct Stu) * n);struct Stu r;int i = 0;for (i = 0; i < n; i++){scanf("%d %d %d", &a[i].g[0], &a[i].g[1], &a[i].g[2]);a[i].sum = a[i].g[0] + a[i].g[1] + a[i].g[2];a[i].n=i+1;}for (i = 0; i < n; i++){int max = 0;int c = 0;for (int j = 0; j < n - 1 - i; j++){if (a[j].sum < a[j+1].sum){r = a[j];a[j] = a[j + 1];a[j + 1] = r;}else if(a[j].sum == a[j + 1].sum){if (a[j].g[0] < a[j + 1].g[0]){r = a[j];a[j] = a[j + 1];a[j + 1] = r;}else if(a[j].g[0] == a[j + 1].g[0])if (a[j].n>a[j+1].n){r = a[j];a[j] = a[j + 1];a[j + 1] = r;}}}}for (i = 0; i < 5; i++){printf("%d %d\n", a[i].n,a[i].sum);}free(a);a = NULL;return 0;
}