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  1. #include <iostream>
  2. #include <numeric>
  3. #include <vector>
  4. #include <utility>
  5.  
  6. #define PII pair<int,int>
  7. using namespace std;
  8.  
  9. int main() {
  10. 	vector<pair<int,int>> v;
  11. 	v.push_back(PII(1,2));
  12. 	v.push_back(PII(3,4));
  13. 	v.push_back(PII(5,6));
  14. 	int i = 0;
  15. 	cout<<accumulate(v.begin(),v.end(),0,[](auto &a, auto &b){return a + b.first;});
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3228KB
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https://ideone.com/Kf2i7d
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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