Compilare: main.cpp: In function 'std::vector<std::vector<long long int> > RoydFloyd(std::vector<std::vector<long long int> >&)': main.cpp:9:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | for(i=0;i<dist.size();i++) | ~^~~~~~~~~~~~ main.cpp:10:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for(j=0;j<dist.size();j++) | ~^~~~~~~~~~~~ main.cpp:12:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(k=0;k<dist.size();k++) | ~^~~~~~~~~~~~ main.cpp:13:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(i=0;i<dist.size();i++) | ~^~~~~~~~~~~~ main.cpp:14:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(j=0;j<dist.size();j++) | ~^~~~~~~~~~~~