Compilare: user.cpp: In function ‘void DFS()’: user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(idx[x] < a[x].size()) stiva[++vf] = a[x][ idx[x]++ ]; ^ user.cpp: In function ‘void Build()’: user.cpp:41:35: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(H[ rmq[i-1][j+(1<<i-1)] ] < H[ rmq[i][j] ]) rmq[i][j] = rmq[i-1][j+(1<<i-1)]; ^ user.cpp:41:88: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(H[ rmq[i-1][j+(1<<i-1)] ] < H[ rmq[i][j] ]) rmq[i][j] = rmq[i-1][j+(1<<i-1)]; ^ user.cpp: In function ‘int main()’: user.cpp:49:17: warning: unused variable ‘lg’ [-Wunused-variable] int i,k,x,y,lg,res,T; ^ user.cpp:51:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&N,&T); ^ user.cpp:54:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^ user.cpp:65:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&x,&y); ^