Compilare: main.cpp: In function 'void dfs(int)': main.cpp:21:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i = 0; i < v[id].size(); i ++ ) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'void double_dfs(int, int)': main.cpp:31:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 0; i < vt[id].size(); i ++ ) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void kosaraju()': main.cpp:65:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for(int j = 0; j < r[i].size(); j ++) | ~~^~~~~~~~~~~~~