#include <stdio.h>

int main() {
    int N, i, flag = 1;
    int a[100];
    printf("请输入正整数N：");
    scanf("%d", &N);
    printf("请依次输入%d个筷子的长度：", N);
    for (i = 0; 1 <= i <= N; i++) {
        scanf("%d", &a[i]);
    }
    for (i = 1; 1 <= i <= N; i++) {
        if (a[i] != a[0]) {
            flag = 0;
            break;
        }
    }
    if (flag) {
        printf("这%d个筷子长度全部相同\n", n);
    } else {
        printf("这%d个筷子长度不全部相同\n", n);
    }
    return 0;
}

/sandbox/1/a.c:19:54: error: use of undeclared identifier 'n'
        printf("这%d个筷子长度全部相同\n", n);
                                           ^
/sandbox/1/a.c:21:57: error: use of undeclared identifier 'n'
        printf("这%d个筷子长度不全部相同\n", n);
                                             ^
2 errors generated.