二维数组选择排序c语言

以下是C语言中二维数组选择排序的实现：

#include <stdio.h>

void selectionSort(int arr[][3], int n) {
    int i, j, min_idx;
    for (i = 0; i < n-1; i++) {
        min_idx = i;
        for (j = i+1; j < n; j++)
          if (arr[j][0] < arr[min_idx][0])
            min_idx = j;
        int temp[3];
        for (int k = 0; k < 3; k++) {
            temp[k] = arr[min_idx][k];
            arr[min_idx][k] = arr[i][k];
            arr[i][k] = temp[k];
        }
    }
}

int main() {
    int arr[][3] = {{3, 2, 1}, {6, 5, 4}, {9, 8, 7}};
    int n = sizeof(arr)/sizeof(arr[0]);
    selectionSort(arr, n);
    printf("Sorted array: \n");
    for (int i=0; i<n; i++) {
        for (int j=0; j<3; j++)
            printf("%d ", arr[i][j]);
        printf("\n");
    }
    return 0;
}