Compilare: user.cpp: In function ‘int main()’: user.cpp:81:19: warning: variable ‘x1’ set but not used [-Wunused-but-set-variable] int x0=0,y0=0,x1=0,y1=0; ^ user.cpp:81:24: warning: variable ‘y1’ set but not used [-Wunused-but-set-variable] int x0=0,y0=0,x1=0,y1=0; ^ user.cpp:58:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.in","r",stdin); ^ user.cpp:59:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.out","w",stdout); ^ user.cpp:60:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&p); ^ user.cpp:65:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&v[i].a,&v[i].b,&v[i].c,&v[i].d); ^ user.cpp: In function ‘int caut(int, int)’: user.cpp:54:12: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] return poz; ^