Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:19:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:44:23: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(j>(1<<i-1)&&Lvl[rmq[i][j]]>Lvl[rmq[i-1][j-(1<<i-1)]]) ^ user.cpp:44:63: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(j>(1<<i-1)&&Lvl[rmq[i][j]]>Lvl[rmq[i-1][j-(1<<i-1)]]) ^ user.cpp:45:43: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] rmq[i][j]=rmq[i-1][j-(1<<i-1)]; ^ user.cpp:31:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&N,&M); ^ user.cpp:34:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&X),Graph[X].push_back(i); ^ user.cpp:49:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&X,&Y); ^