Submission #956529

#	Time	Username	Problem	Language	Result	Execution time	Memory
956529		moonrabbit2	Election (BOI18_election)	C++17	28 / 100	3034 ms	3136 KiB

election

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.1,sse4.2,popcnt,abm,mmx,avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif
const int N=500005;
int n,a[N],q;
bool chk[N];
string s;
int main(){
	ios::sync_with_stdio(false); cin.tie(0);
	cin>>n>>s>>q;
	for(int i=1;i<=n;i++){
		if(s[i-1]=='C') a[i]=1;
		else a[i]=-1;
	}
	for(int l,r,t=1;t<=q;t++){
		cin>>l>>r;
		int s=0,ans=0,mn=0;
		for(int i=l;i<=r;i++){
			s+=a[i];
			if(s<mn){
				chk[i]=1;
				mn=s;
				ans++;
			} else{
				chk[i]=0;
			}
		}
		s=mn=0;
		for(int i=r;i>=l;i--) if(!chk[i]){
			s+=a[i];
			mn=min(mn,s);
		}
		ans-=mn;
		cout<<ans<<"\n";
	}
	return 0;
}

• Subtask 1: 28 / 28
• Subtask 2: 0 / 54
• Subtask 3: 0 / 18