Submission #1011301

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011301		pcc	Toilets (JOI16_toilets)	C++17	36 / 100	6 ms	3608 KiB

toilets

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

#define ll long long

string s;
vector<ll> pos[2];
ll N,M;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>N>>M;
	if(N>1e6)return 0;
	for(int i = 0;i<M;i++){
		string t;
		int c;
		cin>>t>>c;
		while(c--)s += t;
	}
	reverse(s.begin(),s.end());
	pos[0].push_back(-1);
	for(int i = 0;i<s.size();i++){
		pos[s[i] == 'M'].push_back(i);
	}
	while(pos[0].size()>pos[1].size())pos[0].pop_back();
	if(pos[0].size()<pos[1].size()){
		cout<<"-1\n";
		return 0;
	}
	ll ans = 0;
	for(int i = 0;i<pos[0].size();i++){
		auto it = upper_bound(pos[1].begin(),pos[1].end(),pos[0][i])-pos[1].begin();
		ans = max(ans,1ll*it-i);
	}
	cout<<ans<<'\n';
	return 0;
}

Compilation message (stderr)

toilets.cpp: In function 'int main()':
toilets.cpp:23:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for(int i = 0;i<s.size();i++){
      |                ~^~~~~~~~~
toilets.cpp:32:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |  for(int i = 0;i<pos[0].size();i++){
      |                ~^~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 22 / 22
• Subtask 3: 0 / 64