Compilare: user.cpp: In function ‘int main()’: user.cpp:51:68: warning: operation on ‘sol’ may be undefined [-Wsequence-point] sol=sol=abs(a[i].x-a[gas[j]].x)+abs(a[i].y-a[gas[j]].y); ^ user.cpp:25:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:26:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&a[1].x,&a[1].y); ^ user.cpp:32:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&a[i].x,&a[i].y); ^