Compilare: main.cpp: In function 'int main()': main.cpp:73:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | for (i=0; i<masks.size(); i++) | ~^~~~~~~~~~~~~ main.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for (j=i; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:86:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for (j=0; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:103:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for (j=0; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:109:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for (j=0; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:127:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 127 | for (int i=0; i<masks.size(); i++) | ~^~~~~~~~~~~~~