HDU2082

常生成函数-模板题

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int num[30];
ll a[55],b[55];
int main()
{
    int t;
    scanf("%d",&t);
    while(t--){
        for(int i = 1;i <= 26;++ i) scanf("%d",&num[i]);

        memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));

        for(int i = 0;i <= num[1];++ i)
            a[i] = 1;

        for(int i = 2;i <= 26;++ i){
            if(num[i] == 0) continue;
            int weight = i;
            for(int j = 0;j <= 50;++ j){
                for(int k = 0;k <= num[i] && weight * k + j <= 50;++ k)
                    b[j+k*weight] += a[j];
            }

            for(int j = 0;j <= 50;++ j){
                a[j] = b[j];
                b[j] = 0;
            }
        }
        /*for(int i = 1;i <= 50;++ i)
            printf("%lld ",a[i]);
        printf("\n");*/
        ll ans = 0;
        for(int i = 1;i <= 50;++ i)
            ans += a[i];
        printf("%lld\n",ans);
    }
}

注意，把k+j <= 50 换成 weight*k+j，weight表示每个字母对应的权重