oj.uz

답안 #845451

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
845451 2023-09-06T13:39:32 Z vjudge1 Trener (COCI20_trener) C++17
55 / 110
 128 ms 19424 KB 
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define int long long
const int mod = 1e9 + 7;
long long get(string const& s) {
    const int p = 31;
    const int m = 1e9 + 9;
    long long hash_value = 0;
    long long p_pow = 1;
    for (char c : s) {
        hash_value = (hash_value + (c - 'a' + 1) * p_pow) % m;
        p_pow = (p_pow * p) % m;
    }
    return hash_value;
}
void solve(){
	int n,k;cin >> n >> k;
	string v[n+1][k];
	map < int , vector < int > > mpa;
	for(int i = 1;i<=n;i++){
		for(int j = 0;j<k;j++){
			cin >> v[i][j];
			mpa[get(v[i][j])].push_back(j);
		}
	}
	int dp[n+1][k];
	memset(dp , 0 , sizeof(dp));
	for(int i = 0;i<k;i++)dp[1][i] = 1;
	for(int i = 2;i<=n;i++){
		for(int j = 0;j<k;j++){
			string s1 = string(v[i][j].begin() , v[i][j].end()-1) , s2 = string(v[i][j].begin()+1 , v[i][j].end());
			vector < int > ind1 = mpa[get(s1)];
			vector < int > ind2 = mpa[get(s2)];
			for(auto itr : ind2)ind1.push_back(itr);
			sort(ind1.begin(),ind1.end());
			ind1.resize(unique(ind1.begin() , ind1.end()) - ind1.begin());
			for(auto itr : ind1){
				dp[i][j] = (dp[i][j] + dp[i-1][itr]) % mod;
			}
		}
	}
	int ans = 0;
	for(int i = 0;i<k;i++)ans = (ans + dp[n][i]) % mod;
	cout << ans << endl;
}
signed main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	int testcase = 1;//cin >> testcase;
	while(testcase--)solve();
}

Subtask #1
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 1628 KB Output is correct
2 Correct 5 ms 1628 KB Output is correct
3 Correct 5 ms 1628 KB Output is correct
4 Correct 17 ms 888 KB Output is correct
5 Correct 5 ms 1372 KB Output is correct
6 Correct 8 ms 1372 KB Output is correct
7 Correct 16 ms 860 KB Output is correct

Subtask #3
0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 5 ms 1628 KB Output is correct
6 Correct 5 ms 1628 KB Output is correct
7 Correct 5 ms 1628 KB Output is correct
8 Correct 17 ms 888 KB Output is correct
9 Correct 5 ms 1372 KB Output is correct
10 Correct 8 ms 1372 KB Output is correct
11 Correct 16 ms 860 KB Output is correct
12 Correct 128 ms 19352 KB Output is correct
13 Incorrect 124 ms 19424 KB Output isn't correct
14 Halted 0 ms 0 KB -