一本通 1304：数的划分

数的划分

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Code：

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
//Mystery_Sky
//
#define M 500
#define INF 0x3f3f3f3f
int f[M][M], n, k;
int main() {
    scanf("%d%d", &n, &k);
    for(int i = 1; i <= n; i++) f[i][1] = 1;
    for(int j = 2; j <= k; j++) {
        for(int i = 2; i <= n; i++) {
            if(i > j) f[i][j] = f[i-1][j-1] + f[i-j][j];
            else if(i < j) f[i][j] = 0;
            else f[i][j] = 1;
        }
    }
    printf("%d\n", f[n][k]);
    return 0;
}