Compilare: main.cpp: In function 'int main()': main.cpp:75:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (i=0; i<masks.size(); i++) | ~^~~~~~~~~~~~~ main.cpp:76:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 76 | for (j=i+1; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:88:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | for (j=0; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:102:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 102 | for (j=0; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:108:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 108 | for (j=0; j<masks.size(); j++) | ~^~~~~~~~~~~~~ main.cpp:126:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 126 | for (int i=0; i<masks.size(); i++) | ~^~~~~~~~~~~~~