Compilare: user.cpp: In function ‘int main()’: user.cpp:19:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[4000010]’ [-Wformat=] scanf("%s",&s); ^ user.cpp:25:9: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[0]=NULL; ^ user.cpp:18:9: warning: unused variable ‘m’ [-Wunused-variable] int m,n,len,i,l=0,r=0,k,k0,r0,l0,lung,q,p,nr=0; ^ user.cpp:18:11: warning: unused variable ‘n’ [-Wunused-variable] int m,n,len,i,l=0,r=0,k,k0,r0,l0,lung,q,p,nr=0; ^ user.cpp:18:32: warning: variable ‘r0’ set but not used [-Wunused-but-set-variable] int m,n,len,i,l=0,r=0,k,k0,r0,l0,lung,q,p,nr=0; ^ user.cpp:18:35: warning: variable ‘l0’ set but not used [-Wunused-but-set-variable] int m,n,len,i,l=0,r=0,k,k0,r0,l0,lung,q,p,nr=0; ^ user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin); ^ user.cpp:17:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out","w",stdout); ^ user.cpp:19:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s); ^ user.cpp:21:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+p); ^