Submission #1005020

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005020		vjudge1	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	6 ms	348 KiB

street_lamps

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

#define ll long long
int const N=105;
int const mod=1e9+7;
int n,q;
string s;
int ans[N][N];
set<int> blocked;
int check(int a,int b){
	if( (blocked.lower_bound(a))==blocked.end() || (*(blocked.lower_bound(a)))>=b)
		return 1;
	return 0;
}
void solve1(){
	cin>>s;
	for(int i=0;i<n;i++)
		if(s[i]=='0')
			blocked.insert(i);
	while(q--){
		for(int i=0;i<=n;i++)
			for(int j=i;j<=n;j++)
				ans[i][j]+=check(i,j);
		string o;
		cin>>o;
		if(o=="toggle"){
			int t;
			cin>>t;
			t--;
			if(s[t]=='1'){
				blocked.insert(t);
				s[t]='0';
			}
			else{
				blocked.erase(t);
				s[t]='1';
			}
		}
		else{
			int a,b;
			cin>>a>>b;
			a--;b--;
			cout<<ans[a][b]<<endl;
		}
	}
}

int main(){
	cin>>n>>q;
	if(n<=100 && q<=100)
		solve1();
	else{
		return 0;
		// solve2();
	}
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20