Ural_1012. Kbased Numbers. Version 2(dp)

　　跟Vresion 1一样，就是加了高精度。表示高精度还是不熟。。。

My Code:

#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;

const int N = 1000;

void add(int a[], int b[], int res[]){
    int i;
    for(i = N; i >= 0; i--){
        res[i] = a[i] + b[i];
    }
    for(i = N; i >= 0; i--){
        if(res[i] > 9){
            res[i-1] += res[i]/10;
            res[i] %= 10;
        }
    }
}

void mult(int a[], int k, int res[]){
    int i;
    for(i = N; i >= 0; i--){
        //printf("%d %d %d\n", a[i], k, res[i]);
        res[i] = a[i] * k;
        //printf("%d", res[i]);
    }
    for(i = N; i >= 0; i--){
        if(res[i] > 9){
            res[i-1] += res[i]/10;
            res[i] %= 10;
        }
    }
}

void print(int res[]){
    int i = 0;
    while(res[i] == 0)    i++;
    for(; i <= N; i++){
        printf("%d", res[i]);
    }
    printf("\n");
}

int main(){
    //freopen("data.in", "r", stdin);

    int ans[181][N+1], tmp[N+1];
    int n, k, i;
    while(~scanf("%d%d", &n, &k)){
        memset(ans, 0, sizeof(ans));
        ans[0][N] = k-1;
        ans[1][N] = k*(k-1);
        for(i = 2; i < n; i++){
            memset(tmp, 0, sizeof(tmp));
            add(ans[i-1], ans[i-2], tmp);
            mult(tmp, k-1, ans[i]);
        }
        print(ans[n-1]);
    }
    return 0;
}