Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[cr].size(); ++i) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int cantoposort()': main.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[nod].size(); ++j) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~ main.cpp:108:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~