zoj 1163 The Staircases

#include<stdio.h>#include<iostream>using namespace std;int main(){    double m[501][501];    for(int i=0;i<501;i++)    {         m[0][i] = 1;   }    for(int i=1;i<=500;i++)    {        for(int j=1;j<=500;j++)        { if(i>=j) {     m[i][j] = m[i-j][j-1]+m[i][j-1]; }else {     m[i][j] = m[i][j-1]; }        }    }    int N;    cin >> N;    while(N)    {        printf("%0.0lfn",m[N][N]-1);        cin >>N;    }}