100分，但是Subtask #1全WA，显示未通过，是为什么

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int S[101][101][101];
int w(int a,int b,int c)
{
    if (a <= 0 || b <= 0 || c <= 0)
        return 1;
    if (S[a][b][c] != 0) return  S[a][b][c];
    if (a > 20 || b > 20 ||c > 20)
        return w(20, 20, 20);
    if (a < b && b < c)
        return S[a][b][c]=w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c);
    else return S[a][b][c]=w(a - 1, b, c) + w(a - 1, b - 1, c) + w(a - 1, b, c - 1) - w(a - 1, b - 1, c - 1);
    return S[a][b][c];
}
int main()
{
    int S[101][101][101] = { 0 };
    int n,n1=0;
    int s[3];
    while (1)
    {
        scanf("%d %d %d", &s[0], &s[1], &s[2]);
        if (s[0] == -1 && s[1] == -1 && s[2] == -1)
            break;
        int jieguo = w(s[0], s[1], s[2]);
        printf("w(%d, %d, %d) = %d\n", s[0], s[1], s[2], jieguo);
    }
    return 0;
}