Compilare: main.cpp: In function 'int main()': main.cpp:20:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:22:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&c[i].x,&c[i].y); ^ main.cpp:24:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&b[i].x,&b[i].y); ^ main.cpp:47:89: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] cost=(long long)(b[i].x-b[y].x)*(b[i].x-b[y].x)+(long long)(b[i].y-b[y].y)*(b[i].y-b[y].y); ~~~~~^