Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini1[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini2[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool pairup(int)': main.cpp:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void make_bipartite(int, int)': main.cpp:75:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini2[x].size(); i++) ~^~~~~~~~~~~~~~~~~~ main.cpp:83:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini1[y].size(); i++) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:123:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini2[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~~