hdoj-2082-找单词

#include <iostream>
#include <vector>
#include <cstring>

using namespace std;

const int _max = 60;
int c1[_max], c2[_max];//c1[i]:当前多项式x^i的系数
vector<int> cnt, v;//cnt[i]:第i个字母的个数 v[i]:第i个字母的权值
//请输出能找到的总价值(指数)<=50的单词数(系数)
int main() {
    int t, i, j, k;
    cin >> t;
    while (t--) {
        memset(c1, 0, sizeof(c1));
        memset(c2, 0, sizeof(c2));
        cnt.clear();
        v.clear();
        for (i = 1; i <= 26; ++i) {
            int tmp;
            cin >> tmp;
            if (tmp != 0) {
                cnt.push_back(tmp);
                v.push_back(i);
            }
        }
        if (cnt.empty()) cout << 0 << endl;
        else {
            for (int i = 0; i <= 50 && i / v[0] <= cnt[0]; i += v[0]) c1[i] = 1;
            int len = (int) cnt.size();
            for (i = 1; i < len; ++i) {//第i个表达式,len就是有效元素的个数
                for (j = 0; j <= 50; ++j) {//我们只关心c1和c2运算结果指数<=50的
                    for (k = 0; k + j <= 50 && k / v[i] <= cnt[i]; k += v[i])//k是c2的指数
                        c2[k + j] += c1[j];//c1里的第j个元素与c2里指数为k的元素运算
                }
                for (j = 0; j <= 50; ++j) {
                    c1[j] = c2[j];
                    c2[j] = 0;
                }
            }
            int res = 0;
            for (int i = 1; i <= 50; ++i) res += c1[i];
            cout << res << endl;
        }
    }
    return 0;
}