Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:22: 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:28:22: 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:46:26: 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:73:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < tr2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~~ main.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < tr2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~~ main.cpp:70:14: warning: unused variable 'add' [-Wunused-variable] bool add = 0; ^~~ main.cpp: In function 'void tps2()': main.cpp:99:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:103:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v2[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:96:14: warning: unused variable 'add' [-Wunused-variable] bool add = 0; ^~~ main.cpp: In function 'int main()': main.cpp:137:26: 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:163:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~