Submission #1005018

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005018		vjudge1	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	5069 ms	524288 KiB

street_lamps

#include <bits/stdc++.h>

using namespace std;

int main()
{
	int n,q;
	cin>>n>>q;
	string s;
	cin>>s;
	int pre[n+1],ans[n][n+1]={};
	pre[0]=0;
	for (int i=0;i<n;i++)
		pre[i+1]=pre[i]+(s[i]-'0');
	for (int i=0;i<n;i++)
		for (int j=i+1;j<=n;j++)
			ans[i][j]=(pre[j]-pre[i]==j-i);
	while (q--)
	{
		string t;
		cin>>t;
		if (t=="query")
		{
			int a,b;
			cin>>a>>b;
			cout<<ans[a-1][b-1]<<endl;
		}
		else
		{
			int i;
			cin>>i;
			s[i-1]=char('0'+1-(s[i-1]-'0'));
		}
		pre[0]=0;
		for (int i=0;i<n;i++)
			pre[i+1]=pre[i]+(s[i]-'0');
		for (int i=0;i<n;i++)
			for (int j=i+1;j<=n;j++)
				ans[i][j]+=(pre[j]-pre[i]==j-i);
	}
	
	return 0;
}

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