Compilare: main.cpp: In function 'int main()': main.cpp:100:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 100 | for ( int i = 0; i < st.size(); i ++ ) { | ~~^~~~~~~~~~~ main.cpp:105:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for ( int j = 0; j < dr.size(); j ++ ) { | ~~^~~~~~~~~~~ main.cpp:113:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | for ( int j = 0; j < dr.size(); j ++ ) { | ~~^~~~~~~~~~~