Compilare: user.cpp: In function ‘int main()’: user.cpp:15:17: warning: variable ‘q’ set but not used [-Wunused-but-set-variable] int n,m,i,j,x,k,q,a,y,sqq,c1,c2,l,x1,x2; ^ user.cpp:13:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("elmer.in","r",stdin); ^ user.cpp:14:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("elmer.out","w",stdout); ^ user.cpp:16:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:18:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&v[i].x,&v[i].y); ^ user.cpp:19:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:21:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&v2[i].x,&v2[i].y); ^ user.cpp:107:14: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] sm[x2+1]--; ^ user.cpp:106:14: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] sm[x1]++; ^