Codeforces 1462B - Last Year's Substring Solution

 Solution in C++:

///**********ALLAH IS ALMIGHTY************///

///AH Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh  

1. #include <bits/stdc++.h>
2. using namespace std;
3. int main()
4. {
5. int t,n,i,j,f;
6. cin>>t;
7. while(t--)
8. {
9. string s;
10. cin>>n>>s;
11. if((s.substr(0,4)=="2020")||(s.substr(n-4,4)=="2020"))
12. cout<<"YES"<<endl;
13. else if((s.substr(0,2)=="20")&&(s.substr(n-2,2)=="20"))
14. cout<<"YES"<<endl;
15. else if((s.substr(0,3)=="202")&&(s.substr(n-1,1)=="0"))
16. cout<<"YES"<<endl;
17. else if((s[0]=='2')&&(s.substr(n-3,3)=="020"))
18. cout<<"YES"<<endl;
19. else
20. cout<<"NO"<<endl;
21. }
22. }
23.