Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:19:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Gt[X].size(); i ++ ) { ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:32:11: warning: suggest parentheses around assignment used as truth value [-Wparentheses] Ma[X] = InS[X] = 1; St.push_back( X ); ^ user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < G[X].size(); i ++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:106:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Sol.size(); i ++ ) ^