Compilare: user.cpp: In function ‘int main()’: user.cpp:13:15: warning: unused variable ‘x’ [-Wunused-variable] int n,i,j,x,k,nr=0,st,dr; ^ user.cpp:13:24: warning: unused variable ‘st’ [-Wunused-variable] int n,i,j,x,k,nr=0,st,dr; ^ user.cpp:13:27: warning: unused variable ‘dr’ [-Wunused-variable] int n,i,j,x,k,nr=0,st,dr; ^ user.cpp:11:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ssdj.in","r",stdin); ^ user.cpp:12:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ssdj.out","w",stdout); ^ user.cpp:14:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:17:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",si[i]+1); ^