Compilare: main.cpp: In function 'void DFS(int)': main.cpp:14:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < m[x].size(); i++ ) ~~^~~~~~~~~~~~~ main.cpp: In function 'void DFS2(int)': main.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < m[x].size(); i++ ) ~~^~~~~~~~~~~~~