Submission #883021

#	Time	Username	Problem	Language	Result	Execution time	Memory
883021		vjudge1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++11	15 / 100	1 ms	756 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
#define pb push_back
#define endl ("\n")
#define all(aa) aa.begin(), aa.end()
typedef long long ll;
using namespace std;

int solve(int target, vector<int> v){
	int ret = 0;
	for(int i = 0; i < v.size(); i++){
		target ^=1;
		if(v[i] == target) continue;
		int j;
		for(j = 1; i+j < v.size(); j++){
			if(v[i+j] == target){
				v[i+j]^=1;
				break;
			}
		}
		ret+=j;
	}
	return ret;
}

int main(){
	int n, cnt = 0;
	cin >> n;
	vector<int> v(n);
	for(int i = 0; i < n; i++){
		char c; cin >> c;
		v[i] = (c=='R');
		cnt += v[i];
	}

	if(cnt > (n+1)/2 || (n-cnt) > (n+1)/2){
		cout << -1;
		exit(0);
	}
	if(n > 2*cnt){
		for(int i = 0; i < n; i++) v[i] ^=1;
		cnt = n - cnt;
	}

	int ans = solve(0, v);
	if(!(n&1)) ans = min(ans, solve(1, v));
	
	cout << ans << endl;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int solve(int, std::vector<int>)':
joi2019_ho_t3.cpp:10:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for(int i = 0; i < v.size(); i++){
      |                 ~~^~~~~~~~~~
joi2019_ho_t3.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |   for(j = 1; i+j < v.size(); j++){
      |              ~~~~^~~~~~~~~~

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