连数据都输不进去的代码（逆天

一个蒟蒻的代码。。。连数据都输不进去然鹅debug了半天居然没发现是哪有问题（逆天

#include <cstdio>
#define ll long long
ll n[25][25][25] = {};
ll w(ll a, ll b, ll c){
    if (a <= 0 || b <= 0 || c <= 0) return 1;
    if (a > 20 || b > 20 || c > 20) return w(20, 20, 20);
    if (a < b && b < c){
        if (n[a][b][c - 1] == 0)
            n[a][b][c - 1] = w(a, b, c - 1);
        if (n[a][b - 1][c - 1] == 0)
            n[a][b - 1][c - 1] = w(a, b - 1, c - 1);
        if (n[a][b - 1][c] == 0)
            n[a][b - 1][c] = w(a, b - 1, c);
        n[a][b][c] = n[a][b][c - 1] + n[a][b - 1][c - 1] - n[a][b - 1][c];
    } else {
        if (n[a - 1][b][c] == 0)
            n[a - 1][b][c] = w(a - 1, b, c);
        if (n[a - 1][b - 1][c] == 0)
            n[a - 1][b - 1][c] = w(a - 1, b - 1, c);
        if (n[a - 1][b][c - 1] == 0)
            n[a - 1][b][c - 1] = w(a - 1, b, c - 1);
        if (n[a - 1][b - 1][c - 1] == 0){
            n[a - 1][b - 1][c - 1] = w(a - 1, b - 1, c - 1);
        n[a][b][c] = n[a - 1][b][c] + n[a - 1][b - 1][c] + n[a - 1][b][c - 1] - n[a - 1][b - 1][c - 1];
        }
    }
    return n[a][b][c];
}
int main(){
    ll a, b, c; 
    while(scanf("lld lld lld", &a, &b, &c)){
        if (a == -1 && b == -1 && c == -1) break;
        printf("w(%lld, %lld, %lld) = ", a, b, c);
        if (a > 20) a = 21;
        if (b > 20) b = 21;
        if (c > 20) c = 21;
        printf("%lld\n", w(a, b, c));
    }
    return 0;
}