Submission #40139243

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Source Code Expand

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

void solve()
{
	int n;
	cin >> n;
	string s;
	cin >> s;
	int on=0;
	for(char i:s)
		if(i=='1')
			on++;
	if(on%2==1)
		cout << -1 << endl;
	else if(on==0)
		cout << 0 << endl;
	else if(on>3)
		cout << on/2 << endl;
	else
	{
		bool sign=false;
		for (int i = 0; i < s.size()-1; ++i)
			if(s[i]=='1' and s[i+1]=='1')
				sign=true;
		if(sign==false)
			cout << 1 << endl;
		else
		{
			if(s.size()==2 or s.size()==3)
				cout << -1 << endl;
			else
			{
				if(s.size()==4 and s[0]=='0' and s[3]=='0')
					cout << -1 << endl;
				else
					cout << 2 << endl;
			}
		}
	}
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL), cout.tie(NULL);
	int t;
	cin >> t;
	while(t--)
		solve();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void solve()’:
./Main.cpp:39:21: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   39 |   for (int i = 0; i < s.size()-1; ++i)
      |                   ~~^~~~~~~~~~~~

Judge Result