Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:21: warning: statement has no effect [-Wunused-value] for ( start[node]; start[node] < graph[node].size() && ok == 0; start[node]++ ){ ~~~~~~~~~~^ main.cpp:17:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( start[node]; start[node] < graph[node].size() && ok == 0; start[node]++ ){ ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~