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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=1e9+7;
  5. const ll INF = 10000000000000;
  6. const int N = 1e6+7;
  7.  
  8.     void solve() {
  9.        int n;
  10.        string s;
  11.        cin >> n >> s;
  12.        bool ok = false;
  13.        for(int i=0;i<n-1;i++){
  14.             if(i%2==0){
  15.                 if(s[i]=='1' && s[i+1]=='1') ok=true;
  16.             }
  17.        }
  18.        if(n%2==1){
  19.        if(ok || s[0]=='1') cout << "YES\n";
  20.        else cout << "NO\n";}
  21.        else if(n%2==0){
  22.        if(ok || s[0]=='1' || s[n-1]=='1') cout << "YES\n";
  23.        else cout << "NO\n";
  24.        }
  25.     }
  26. int main(){ 
  27.     ios::sync_with_stdio(false);
  28.     cin.tie(nullptr);
  29.  
  30.     int t;
  31.     cin >> t;
  32.     while (t--) solve();
  33.  
  34.     return 0;
  35. }
  36.  
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin
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5
2
11
3
010
12
101111111100
10
0111111011
8
01000010
stdout
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YES
NO
YES
YES
NO
https://ideone.com/HLmc1V
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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