Compilare: user.cpp: In function ‘int main()’: user.cpp:12:19: warning: unused variable ‘k’ [-Wunused-variable] int w,h,n,i,j,k,r,x,y; ^ user.cpp:12:25: warning: unused variable ‘y’ [-Wunused-variable] int w,h,n,i,j,k,r,x,y; ^ user.cpp:10:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("intersectii.in", "r",stdin); ^ user.cpp:11:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("intersectii.out", "w",stdout); ^ user.cpp:13:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &h, &w, &n); ^ user.cpp:29:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^