Compilare: main.cpp: In function 'int main()': main.cpp:130:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 130 | for(int i = 1; i < st.size(); i ++) { | ~~^~~~~~~~~~~ main.cpp:141:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 141 | for(int i = 0; i < ad_apm[old_x].size(); i ++) | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:145:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 145 | for(int i = 0; i < ad_apm[old_y].size(); i ++) | ~~^~~~~~~~~~~~~~~~~~~~~~