Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tr[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void cantoposort()': main.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void tps()': main.cpp:71:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < tr2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~~ main.cpp:68:14: warning: unused variable 'add' [-Wunused-variable] bool add = 0; ^~~ main.cpp: In function 'void tps2()': main.cpp:97:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:94:14: warning: unused variable 'add' [-Wunused-variable] bool add = 0; ^~~ main.cpp: In function 'int main()': main.cpp:135:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[i].size(); ++j) ~~^~~~~~~~~~~~~ main.cpp:153:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v2[i].size(); ++j) ~~^~~~~~~~~~~~~~ main.cpp:161:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~