Compilare: user.cpp: In function ‘int main()’: user.cpp:51:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,l,x,y,st,dr; ^ user.cpp:51:23: warning: unused variable ‘st’ [-Wunused-variable] int n,m,i,j,l,x,y,st,dr; ^ user.cpp:51:26: warning: unused variable ‘dr’ [-Wunused-variable] int n,m,i,j,l,x,y,st,dr; ^ user.cpp:49:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.in","r",stdin); ^ user.cpp:50:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.out","w",stdout); ^ user.cpp:52:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:55:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^