Submission #845332

#	Time	Username	Problem	Language	Result	Execution time	Memory
845332		vjudge1	Trener (COCI20_trener)	C++17	0 / 110	6 ms	1628 KiB

trener

#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;
const int p = 31;
int HASH(string str){
	int k = 1 , ret = 0;
	for(auto itr : str){
		ret = (ret + k * (itr - 'a')) % mod;
		k = (k * p) % mod;
	}
	return ret;
}
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[HASH(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++){
			vector < int > ind1 = mpa[HASH(string(v[i][j].begin() , v[i][j].end()-1))];
			vector < int > ind2 = mpa[HASH(string(v[i][j].begin()+1 , v[i][j].end()))];
			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: 0 / 22
• Subtask 2: 0 / 33
• Subtask 3: 0 / 55