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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n,q; cin >> n >> q;
  6. 	vector <string> v;
  7. 	vector <vector <int> > pref(n+1, vector <int>(26,0)); // pref[i][j] -> it means that cumulative frquency of characters from 'a' to 'z' is being stored till ith index
  8. 	for(int i = 0; i < n; i++) {
  9. 		string s; cin >> s;
  10. 		v.push_back(s);
  11.  
  12. 		for(int j = 0; j < s.length(); j++) {
  13. 			pref[i+1][s[j]-'a']++;
  14. 		}
  15. 	}
  16.  
  17. 	for(int i = 2; i < n+1; i++) {
  18. 		for(int j = 0; j < 26; j++) pref[i][j] += pref[i-1][j];
  19. 	}
  20.  
  21. 	while(q--) {
  22. 		int l,r,k; cin >> l >> r >> k;
  23. 		int cnt = 0;
  24. 		char op;
  25. 		for(int i = 0; i < 26; i++) {
  26. 			cnt += pref[r][i] - pref[l-1][i];
  27. 			if(cnt >= k) {
  28. 			    op = i+97;
  29. 			    break;
  30. 			}
  31. 		}
  32. 		cout << op << "\n";
  33. 	}
  34.  
  35. }
Success #stdin #stdout 0s 5672KB
comments (?)
stdin
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3 2
abcc
trea 
zape
2 3 5
2 2 1
stdout
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p
a
https://ideone.com/yC3l2N
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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