似乎不必定义二维数组。

#include <stdio.h>

int main() {
    int n, m;
    scanf("%d %d\n", &n, &m);
    int height, highest = - (1 << 31);
    int x = 1, y = 1;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            scanf("%d", &height);
            if (height > highest) {
                highest = height;
                x = i;
                y = j;
            }
        }
        scanf("\n");
    }
    printf("%d %d\n", x, y);
    return 0;
}