제출 #675843

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
675843		Dan4Life	가로등 (APIO19_street_lamps)	C++17	0 / 100	59 ms	1180 KiB

street_lamps

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

const int maxn = (int)3e5+10;

string s;
int a[maxn];
int cnt[maxn], ti[maxn];
int n, q;

int32_t main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n >> q >> s;
	for(int i = 1; i <= n; i++){
		a[i] = (s[i-1]=='1');
		ti[i] = (a[i]==1?0:-1);
	}

	for(int i = 1; i <= q; i++){
		int x, y; cin >> s >> x;

		if(s[0]=='t'){
			a[x]^=1;
			//if turned to 1, cnt[x]+=now-last time it was turned to 1
			//cntx = number of times x was 0
			//ti x = last time x was a 1 

			if(a[x]==1){
				if(ti[x]!=-1) cnt[x]+=i-ti[x]-1; 
				else cnt[x]=i;
				ti[x]=i;
			}
			else ti[x]=i-1;
		}
		else{
			cin >> y;
			int tot = 0;
			//cout << i << " " << cnt[x] << " " << ti[x] << " ";
			if(ti[x]!=-1){
				if(a[x]==1) tot = i-cnt[x];
				else tot = ti[x]-cnt[x];
			}
			cout << tot << "\n";
		}
	}
}

• Subtask 1: 0 / 20
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• Subtask 3: 0 / 20
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• Subtask 5: 0 / 20