Compilare: user.cpp: In function ‘int main()’: user.cpp:11:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,j,x,st,dr,st2,dr2,njoin=0; ^ user.cpp:11:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,x,st,dr,st2,dr2,njoin=0; ^ user.cpp:11:25: warning: unused variable ‘st2’ [-Wunused-variable] int n,m,i,j,x,st,dr,st2,dr2,njoin=0; ^ user.cpp:11:29: warning: unused variable ‘dr2’ [-Wunused-variable] int n,m,i,j,x,st,dr,st2,dr2,njoin=0; ^ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permsplit.in","r",stdin); ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permsplit.out","w",stdout); ^ user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:16:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^