Compilare: main.cpp: In function 'int main()': main.cpp:47:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | while ( i < dfs_order.size() && dfs_order[i] != node_cycle ) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:51:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for ( int j = i; j < dfs_order.size(); j++ ) { | ~~^~~~~~~~~~~~~~~~~~