Compilare: user.cpp: In function ‘int main()’: user.cpp:22:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000005]’ [-Wformat=] scanf("%s %s", &A, &B); ^ user.cpp:22:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2000005]’ [-Wformat=] user.cpp:57:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d\n",k); ^ user.cpp:59:30: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘__gnu_cxx::__alloc_traits<std::allocator<long long int> >::value_type {aka long long int}’ [-Wformat=] printf("%d ",match[i]); ^ user.cpp:20:37: 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:21:39: 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:22:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s", &A, &B); ^