Submission #920304

#	Time	Username	Problem	Language	Result	Execution time	Memory
920304		vjudge1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	100 / 100	51 ms	29528 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
using namespace std;
const int inf = 1e9 + 7;
const int N = 405;
int pre[N][3];
inline void ckmin(int &x , int y){
	x = min(x,y);
}
int eval(int tar , int c0 , int c1 , int c2){
	if(tar == 0)return 0;
	int temptar = tar;
	tar -= min(c0 , pre[temptar-1][0]);
	tar -= min(c1 , pre[temptar-1][1]);
	tar -= min(c2 , pre[temptar-1][2]);
	return tar;
}
void solve(){
	int n;
	cin >> n;
	string str;
	cin >> str;
	vector < int > ind[3];
	for(int i = 0;i<n;i++){
		if(str[i] == 'R'){
			ind[0].push_back(i);
			pre[i][0] = 1;
		}
		else if(str[i] == 'G'){
			ind[1].push_back(i);
			pre[i][1] = 1;
		}
		else if(str[i] == 'Y'){
			ind[2].push_back(i);
			pre[i][2] = 1;
		}
		else assert(false);
	}
	for(int i = 0;i<3;i++){
		for(int j = 1;j<n;j++){
			pre[j][i] += pre[j-1][i];
		}
	}
	int dp[ind[0].size()+2][ind[1].size()+2][ind[2].size()+2][3];
	for(int i = 0;i<=ind[0].size();i++){
		for(int j = 0;j<=ind[1].size();j++){
			for(int k = 0;k<=ind[2].size();k++){
				dp[i][j][k][0] = dp[i][j][k][1] = dp[i][j][k][2] = inf;
			}
		}
	}
	dp[0][0][0][0] = 0;
	dp[0][0][0][1] = 0;
	dp[0][0][0][2] = 0;
	for(int cnt0 = 0;cnt0 <= (int)ind[0].size();cnt0++){
		for(int cnt1 = 0;cnt1 <= (int)ind[1].size();cnt1++){
			for(int cnt2 = 0;cnt2 <= (int)ind[2].size();cnt2++){
				if(cnt0 != (int)ind[0].size()){
					ckmin(dp[cnt0+1][cnt1][cnt2][0] , dp[cnt0][cnt1][cnt2][1] + eval(ind[0][cnt0] , cnt0,cnt1,cnt2));
					ckmin(dp[cnt0+1][cnt1][cnt2][0] , dp[cnt0][cnt1][cnt2][2] + eval(ind[0][cnt0] , cnt0,cnt1,cnt2));
				}
				if(cnt1 != (int)ind[1].size()){
					ckmin(dp[cnt0][cnt1+1][cnt2][1] , dp[cnt0][cnt1][cnt2][0] + eval(ind[1][cnt1] , cnt0,cnt1,cnt2));
					ckmin(dp[cnt0][cnt1+1][cnt2][1] , dp[cnt0][cnt1][cnt2][2] + eval(ind[1][cnt1] , cnt0,cnt1,cnt2));
				}
				if(cnt2 != (int)ind[2].size()){
					ckmin(dp[cnt0][cnt1][cnt2+1][2] , dp[cnt0][cnt1][cnt2][0] + eval(ind[2][cnt2] , cnt0,cnt1,cnt2));
					ckmin(dp[cnt0][cnt1][cnt2+1][2] , dp[cnt0][cnt1][cnt2][1] + eval(ind[2][cnt2] , cnt0,cnt1,cnt2));
				}
			}
		}
	}
	int ans = inf;
	for(int i = 0;i<3;i++){
		ans = min(ans , dp[ind[0].size()][ind[1].size()][ind[2].size()][i]);
	}
	cout << (ans == inf ? -1 : ans) << endl;
}
signed main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	int testcase = 1;//cin >> testcase;
	while(testcase--)solve();
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'void solve()':
joi2019_ho_t3.cpp:44:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  for(int i = 0;i<=ind[0].size();i++){
      |                ~^~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   for(int j = 0;j<=ind[1].size();j++){
      |                 ~^~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |    for(int k = 0;k<=ind[2].size();k++){
      |                  ~^~~~~~~~~~~~~~~

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