Compilare: user.cpp: In function ‘int main()’: user.cpp:39:13: warning: unused variable ‘x1’ [-Wunused-variable] int n,m,x1,y1,x2,y2,nr=0; ^ user.cpp:39:16: warning: unused variable ‘y1’ [-Wunused-variable] int n,m,x1,y1,x2,y2,nr=0; ^ user.cpp:39:19: warning: unused variable ‘x2’ [-Wunused-variable] int n,m,x1,y1,x2,y2,nr=0; ^ user.cpp:39:22: warning: unused variable ‘y2’ [-Wunused-variable] int n,m,x1,y1,x2,y2,nr=0; ^ user.cpp:37:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dsip.in", "r", stdin); ^ user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dsip.out", "w", stdout); ^ user.cpp:40:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:41:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d%d",&v[i].x,&v[i].y); ^ user.cpp:45:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&q[i].x1,&q[i].y1,&q[i].x2,&q[i].y2); ^