Submission #972567

#	Time	Username	Problem	Language	Result	Execution time	Memory
972567		happy_node	Copy and Paste 3 (JOI22_copypaste3)	C++17	57 / 100	3097 ms	74952 KiB

copypaste3

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

const int MX=2505;

int N, A, B, C;
string s;
ll dp[MX][MX];
ll ndp[MX];

const int P=1e9+93, mod=2'147'483'647;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

ll hsh[MX][MX], pw[MX], key[MX];

bool ok(int a, int b, int l, int r) {
	if(l<=b) return false;
	return hsh[a][b]==hsh[l][r];
}

int main() {
	cin.tie(0); ios_base::sync_with_stdio(0);

	for(int i=0;i<MX;i++)
		for(int j=i;j<MX;j++)
			dp[i][j]=2e18;

	pw[0]=1;
	for(int i=1;i<MX;i++) pw[i]=pw[i-1]*P%mod;

	cin>>N;
	cin>>s;
	cin>>A>>B>>C;

	s='#'+s;

	for(int c=0;c<26;c++) key[c]=rng()%mod;

	for(int l=1;l<=N;l++) {
		for(int r=l;r<=N;r++) {
			int p=r-l+1;
			hsh[l][r]=hsh[l][r-1]+pw[p]*(key[s[r]-'a'])%mod;
			hsh[l][r]%=mod;
		}
	}

	for(int l=N;l>0;l--) {
		for(int r=l;r<=N;r++) {
			dp[l][r]=min(dp[l][r],dp[l][r-1]+A);

			for(int k=r;k<=N;k++) ndp[k]=2e18;
			
			int len=r-l+1;
			ndp[r]=min(dp[l][r]+B+C,dp[l][r]+B+dp[l][r]);

			for(int k=r+1;k<=N;k++) {
				if(ok(l,r,k-len+1,k)) ndp[k]=min(ndp[k],ndp[k-len]+C);
				ndp[k]=min(ndp[k],ndp[k-1]+A);
			}
			for(int k=r+1;k<=N;k++) {
				dp[l][k]=min(dp[l][k],ndp[k]);
			}

			dp[l-1][r]=min(dp[l-1][r],dp[l][r]+A);
		}
	}

	cout<<dp[1][N]<<'\n';

}

• Subtask 1: 1 / 1
• Subtask 2: 0 / 5
• Subtask 3: 14 / 14
• Subtask 4: 10 / 10
• Subtask 5: 32 / 32
• Subtask 6: 0 / 38