Compilare: user.cpp: In function ‘int main()’: user.cpp:29:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[10000001]’ [-Wformat=] scanf("%s",&s);k=0; ^ user.cpp:32:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[21]’ [-Wformat=] while(scanf("%s",&s1)!=EOF){ ^ user.cpp:26:30: warning: variable ‘k2’ set but not used [-Wunused-but-set-variable] int nr1,nr2,p1,p2,n,i,k1,k2,nnr1,nnr2,r,cate,j; ^ user.cpp:27:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.in","r",stdin); ^ user.cpp:28:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.out","w",stdout); ^ user.cpp:29:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s);k=0; ^ user.cpp:26:23: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nr1,nr2,p1,p2,n,i,k1,k2,nnr1,nnr2,r,cate,j; ^