Compilare: main.cpp: In function 'void perform()': main.cpp:16:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i = 0;i < v.size();i++) { | ^ main.cpp:34:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i = 0;i < v.size();i++) { | ^