Compilare: main.cpp: In function 'void BFS(int)': main.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i = 0;i < king.size();i++) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:83:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for(int k = 0;k < queen.size();k++) { | ~~^~~~~~~~~~~~~~