Submission #384507

#	Time	Username	Problem	Language	Result	Execution time	Memory
384507		aryan12	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	0 / 100	4 ms	1260 KiB

joi2019_ho_t3

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

const int N = 405;
vector<int> red, yellow, green;
int pref[3][N];

int sum(int idx_from, int to, int from) {
	if(from < to)
		return 0;
	return pref[idx_from][from] - pref[idx_from][to];
}

void Solve() {
	int n;
	cin >> n;
	string s;
	cin >> s;
	int red_cnt = 0, yellow_cnt = 0, green_cnt = 0;
	pref[0][0] = 0;
	pref[1][0] = 0;
	pref[2][0] = 0;
	red.push_back(0);
	yellow.push_back(0);
	green.push_back(0);
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'R') {
			red_cnt++;
			red.push_back(i);
			pref[0][i]++;
		}
		else if(s[i] == 'Y') {
			yellow_cnt++;
			yellow.push_back(i);
			pref[1][i]++;
		}
		else {
			green_cnt++;
			green.push_back(i);
			pref[2][i]++;
		}
		if(i != 0) {
			pref[0][i] += pref[0][i - 1];
			pref[1][i] += pref[1][i - 1];
			pref[2][i] += pref[2][i - 1];
		}
	}
	int dp[red_cnt + 1][yellow_cnt + 1][green_cnt + 1][3];
	for(int i = 0; i <= red_cnt; i++) {
		for(int j = 0; j <= yellow_cnt; j++) {
			for(int k = 0; k <= green_cnt; k++) {
				for(int l = 0; l < 3; l++) {
					dp[i][j][k][l] = INT_MAX;
				}
			}
		}
	}
	for(int l = 0; l < 3; l++) {
		dp[0][0][0][l] = 0;
	}
	for(int i = 0; i <= red_cnt; i++) {
		for(int j = 0; j <= yellow_cnt; j++) {
			for(int k = 0; k <= green_cnt; k++) {
				if(i == 0 && j == 0 && k == 0)
					continue;
				for(int cur = 0; cur < 3; cur++) {
					for(int last = 0; last < 3; last++) {
						if(cur == last)
							continue;
						if(cur == 0) {
							if(i == 0)
								continue;
							dp[i][j][k][cur] = min(dp[i][j][k][cur], dp[i - 1][j][k][last] + sum(1, yellow[j], red[i]) + sum(2, green[k], red[i]));
						}
						else if(cur == 1) {
							if(j == 0)
								continue;
							dp[i][j][k][cur] = min(dp[i][j][k][cur], dp[i][j - 1][k][last] + sum(0, red[i], yellow[j]) + sum(2, green[k], yellow[j]));
						}
						else {
							if(k == 0)
								continue;
							dp[i][j][k][cur] = min(dp[i][j][k][cur], dp[i][j][k - 1][last] + sum(0, red[i], green[k]) + sum(1, yellow[j], green[k]));
						}
					}
				}
			}
		}
	}
	int ans = min(dp[red_cnt][yellow_cnt][green_cnt][0], min(dp[red_cnt][yellow_cnt][green_cnt][1], dp[red_cnt][yellow_cnt][green_cnt][2]));
	if(ans >= 1e7) {
		cout << "-1\n";
	}
	else {
		cout << ans << "\n";
	}
}

int32_t main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	Solve();
	return 0;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'void Solve()':
joi2019_ho_t3.cpp:27:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |  for(int i = 0; i < s.size(); i++) {
      |                 ~~^~~~~~~~~~

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