Submission #1000256

#	Time	Username	Problem	Language	Result	Execution time	Memory
1000256		biximo	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	0 / 100	454 ms	1048576 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
#define N 405
#define INF 2000000000
using namespace std;
int n,dp[N][N][N][4], rs[N], gs[N], ys[N];
string s;
int cost(int r, int g, int y, int i) {
	return abs(rs[i]-r)+abs(gs[i]-g)+abs(ys[i]-y);
}
int main() {
    cin.tie(0)->sync_with_stdio(0);
   	cin >> n >> s;
   	for(int i = 1; i <= n; i ++) {
   		rs[i] = rs[i-1]+(s[i-1]=='R');
   		gs[i] = gs[i-1]+(s[i-1]=='G');
   		ys[i] = ys[i-1]+(s[i-1]=='Y');
   	}
   	for(auto&i: dp) for(auto&j: i) for(auto&k: j) for(auto&l: k) l = INF;
   	dp[0][0][0][0] = 0;
   	for(int i = 0; i < n; i ++) {
   		for(int r = 0; r <= i && r <= rs[n]; r ++) {
   			for(int g = 0; r+g <= i && g <= gs[n]; g ++) {
   				int y = i-r-g;
   				if(y > ys[n]) continue;
   				for(int t = (i!=0); t <= 3; t ++) {
	   				if(t != 1)
	   				dp[i+1][r+1][g][1] = min(dp[i+1][r+1][g][1],dp[i][r][g][t]+cost(r+1,g,y,i+1));
	   				if(t != 2)
	   				dp[i+1][r][g+1][2] = min(dp[i+1][r][g+1][2],dp[i][r][g][t]+cost(r,g+1,y,i+1));
	   				if(t != 3)
	   				dp[i+1][r][g][3] = min(dp[i+1][r][g][3],dp[i][r][g][t]+cost(r,g,y+1,i+1));
   				}
   			}
   		}
   	}
   	// cout << dp[2][1][0][1] << "\n";
   	// cout << dp[3][1][0][3] << "\n";
   	// cout << dp[4][2][0][1] << "\n";
   	// cout << dp[5][2][0][3] << "\n";
   	// cout << dp[6][2][1][2] << "\n";
   	int res = min({dp[n][rs[n]][gs[n]][1],dp[n][rs[n]][gs[n]][2],dp[n][rs[n]][gs[n]][3]})/2;
   	assert(res%2==0);
   	if(res == INF/2) cout << -1;
   	else cout << res;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 55
• Subtask 3: 0 / 15
• Subtask 4: 0 / 25