csp202112-2运行错误

此题为cspccf202112_3题，思路完全理解了，代码能跑70分，避免数字溢出还专门用了long long型，但是不知道为什么csp官网检测会报错

#include "stdio.h"
#include "stdlib.h"
#include "math.h"

int main(){
    int n;
    long long int sub = 0;
    long long int *A, r, N, *f, rf, rg;
    long long int length = 0;
    scanf("%d %lld", &n, &N);
    r = N / (n + 1);
    A = (long long int *)calloc(n + 10, sizeof(long long int));
    A[0] = 0;
    A[n + 1] = N;
    f = (long long int *)calloc(N + 10, sizeof(long long int));
    //g = (long long int *)calloc(N, sizeof(long long int));
    for (int i = 1; i < (n + 1); i++){
        scanf("%lld", &A[i]);
        if (A[i] < N)f[A[i]] = i;
    }
    for (long long int i = 1; i < N; i++){//完成g[],f[]
        //g[i] = i / r;
        if (f[i] == 0)
            f[i] = f[i - 1];
        else continue;
    }
    for (int j = 0; j < n + 1; j++){
        for (long long int i = A[j]; i < A[j + 1]; i += length){
            rf = A[j + 1] - i;//rf = A[j + 1] - 1;
            rg = r - i%r;//rg = i + r - 1 - i%r;
            length = (rf>rg ? rg : rf);//length = (rf>rg ? rg : rf) - i + 1;
            sub += length*(abs(f[i] - i/r));
        }
    }
    printf("%lld", sub);
    system("pause");
    return 0;
}

错误截图：

img


求解惑，提供个思路我自己调试也行！

https://blog.csdn.net/weixin_45798993/article/details/123098719
.https://blog.csdn.net/Crispo_W/article/details/123075225