#include<bits/stdc++.h> using namespace std; #define int long long const int MOD = 1000000007; signed main(){ int n, x; cin >> n >> x; string s; cin >> s; //番兵 s.push_back('m'); n = (int)s.size(); vector<vector<vector<int> > > dp(n + 2, vector<vector<int> > (x + 1, vector<int> (n + 1, 0))); dp[0][0][0] = 1LL; for(int i = 0; i < n; i++){ //cout << s[i] << endl; for(int j = 0; j <= x; j++){ for(int k = 0; k <= n; k++){ if(dp[i][j][k] == 0) continue; if(s[i] == '2' || s[i] == '?'){ if(k % 2 == 0){ dp[i + 1][j][k + 1] += dp[i][j][k]; dp[i + 1][j][k + 1] %= MOD; }else{ int num = k / 2; int sum = ((1 + num) * num) / 2; if(j + sum <= x){ dp[i + 1][j + sum][1] += dp[i][j][k]; dp[i + 1][j + sum][1] %= MOD; } } } if(s[i] == '5' || s[i] == '?'){ if(k % 2 == 1){ dp[i + 1][j][k + 1] += dp[i][j][k]; dp[i + 1][j][k + 1] %= MOD; }else{ int num = k / 2; int sum = ((1 + num) * num) / 2; if(j + sum <= x){ dp[i + 1][j + sum][0] += dp[i][j][k]; dp[i + 1][j + sum][0] %= MOD; } } } if((s[i] != '2' && s[i] != '5') || s[i] == '?'){ int val = 1; if(s[i] == '?') val = 8; int num = k / 2; int sum = ((1 + num) * num) / 2; if(j + sum <= x){ dp[i + 1][j + sum][0] += dp[i][j][k] * val; dp[i + 1][j + sum][0] %= MOD; } //cout << i << " " << j << " " << k << " " << num << " " << sum << endl; } } } } cout << dp[n][x][0] << endl; return 0; }
Task問題 | A - ニコニコ文字列2 |
---|---|
User nameユーザ名 | monkukui |
Created time投稿日時 | |
Language言語 | C++14 (GCC 5.4.1) |
Status状態 | WA |
Score得点 | 0 |
Source lengthソースコード長 | 2418 Byte |
File nameファイル名 | |
Exec time実行時間 | ms |
Memory usageメモリ使用量 | - |
Set name | Score得点 / Max score | Cases |
---|---|---|
Sample | - | sample_01.txt,sample_02.txt |
All | 0 / 20 | sample_01.txt,sample_02.txt,subtask1_01.txt,subtask1_02.txt,subtask1_03.txt,subtask1_04.txt,subtask1_05.txt,subtask1_06.txt,subtask1_07.txt,subtask1_08.txt,subtask1_09.txt,subtask1_10.txt,subtask1_11.txt,subtask1_12.txt,subtask1_13.txt,subtask1_14.txt,subtask1_15.txt,subtask1_16.txt,subtask1_17.txt,subtask1_18.txt,subtask1_19.txt,subtask1_20.txt,subtask1_21.txt,subtask1_22.txt |
Case name | Status状態 | Exec time実行時間 | Memory usageメモリ使用量 |
---|---|---|---|
sample_01.txt | AC | 1 ms | 256 KB |
sample_02.txt | WA | ||
subtask1_01.txt | AC | 1 ms | 256 KB |
subtask1_02.txt | AC | 1 ms | 256 KB |
subtask1_03.txt | AC | 1 ms | 256 KB |
subtask1_04.txt | AC | 1 ms | 256 KB |
subtask1_05.txt | WA | ||
subtask1_06.txt | AC | 9 ms | 11648 KB |
subtask1_07.txt | WA | ||
subtask1_08.txt | WA | ||
subtask1_09.txt | WA | ||
subtask1_10.txt | WA | ||
subtask1_11.txt | WA | ||
subtask1_12.txt | AC | 98 ms | 131328 KB |
subtask1_13.txt | WA | ||
subtask1_14.txt | AC | 101 ms | 131328 KB |
subtask1_15.txt | WA | ||
subtask1_16.txt | WA | ||
subtask1_17.txt | WA | ||
subtask1_18.txt | AC | 98 ms | 131328 KB |
subtask1_19.txt | WA | ||
subtask1_20.txt | WA | ||
subtask1_21.txt | WA | ||
subtask1_22.txt | WA |