Compilare: user.cpp: In function ‘void DFS()’: user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < q[x].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:66:9: warning: unused variable ‘i’ [-Wunused-variable] int i,c,id,x,y,Q,K; ^ user.cpp:68:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&c,&Q,&K); ^ user.cpp:70:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d %d",&c,&id,&x,&y); ^ user.cpp:80:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^