제출 #17520

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
17520		gs14004	원형 문자열 (IZhO13_rowords)	C++14	84 / 100	278 ms	46712 KiB

rowords

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <complex>
#include <algorithm>
#include <string>
#include <functional>
#include <vector>
#include <numeric>
#include <deque>
#include <utility>
#include <bitset>
#include <iostream>
using namespace std;
typedef long long lint;
typedef long double llf;
typedef pair<int, int> pi;
typedef complex<double> pnt;

string s1, s2;

int dp[4005][2005];
int nxt[4005][2005];
int n, m;

void reroot(int px){
	int py = 2;
	while(py <= m && nxt[px][py] != 2) py++;
	nxt[px][py] = 1;
	while(px < 2 * n && py < m){
		if(nxt[px+1][py] == 3){
			px++;
			nxt[px][py] = 1;
		}
		else if(nxt[px+1][py+1] == 2){
			px++;
			py++;
			nxt[px][py] = 1;
		}
		else py++;
	}
	while(px < 2 * n && nxt[px+1][py] == 3){
		px++;
		nxt[px][py] = 1;
	}
}

int track(int x, int y, int e){
	int ret = 0;
	while(y != 0 && x != e){
		if(nxt[x][y] == 1) y--;
		else if(nxt[x][y] == 2) ret += (s1[x] == s2[y]), x--, y--;
		else if(nxt[x][y] == 3) x--;
	}
	return ret;
}

int solve(string a, string b){
	s1 = a, s2 = b;
	n = s1.size(), m = s2.size();
	s1 = s1 + s1;
	s1 = '#' + s1;
	s2 = '#' + s2;
	for(int i=1; i<=2*n; i++){
		for(int j=1; j<=m; j++){
			dp[i][j] = -1;
			if(dp[i][j] < dp[i][j-1]){
				dp[i][j] = dp[i][j-1];
				nxt[i][j] = 1;
			}
			if(dp[i][j] < dp[i-1][j-1] + (s1[i] == s2[j])){
				dp[i][j] = dp[i-1][j-1] + (s1[i] == s2[j]);
				nxt[i][j] = 2;
			}
			if(dp[i][j] < dp[i-1][j]){
				dp[i][j] = dp[i-1][j];
				nxt[i][j] = 3;
			}
		}
	}
	int ret = dp[n][m];
	for(int i=2; i<=n; i++){
		reroot(i);
		ret = max(ret, track(n-1+i, m, i-1));
	}
	return ret;
}

int main(){
	string a, b;
	cin >> a >> b;
	int ret = solve(a, b);
	reverse(b.begin(), b.end());
	ret = max(ret, solve(a, b));
	cout << ret;
}

• Subtask 1: 84 / 100