Compilare: user.cpp: In function ‘int main()’: user.cpp:23:21: warning: unused variable ‘M’ [-Wunused-variable] int i,j,k,now,N,M; ^ user.cpp:26:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&N); ^ user.cpp:27:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= N; ++i) fscanf(fin,"%d %d",&v[i].x,&v[i].y); ^ user.cpp:23:13: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,j,k,now,N,M; ^