Compilare: user.cpp: In function ‘void read()’: user.cpp:24:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i!=1) ^ user.cpp:27:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(j!=1) ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:38:29: 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:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^