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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int N,M;
  6. 	cin >> N;
  7. 	vector<int> A(N);
  8. 	map<int,int> C;
  9. 	for(int i =0; i < N; i++) {
  10. 		cin >> A[i];
  11. 		C[A[i]] +=1;}
  12. 	if(C.size() == 1) {cout << "0\n"; return 0;}
  13. 	cin >> M;
  14. 	for(int i =0; i < M; i++) {
  15. 		int x,y;
  16. 		cin >> x >> y;
  17. 		x--;
  18. 		C[A[x]] -=1;
  19. 		C[y] +=1;
  20. 		A[x] =y;
  21. 		if(C[y] == N) {cout << i+1 << "\n"; return 0;}
  22. 		}
  23. 	cout << "-1\n";
  24. 	return 0;}
Success #stdin #stdout 0s 3484KB
comments (?)
stdin
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3
4 3 7
4
1 5
2 7
1 7
3 3
stdout
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3
https://ideone.com/XNk6qa
SAU qual ACM 2014/15 D
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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