Compilare: user.cpp: In function ‘int main()’: user.cpp:18:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[20000001]’ [-Wformat=] scanf("%s%s", &x, &y); ^ user.cpp:18:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[20000001]’ [-Wformat=] user.cpp:15:39: 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:16:41: 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:18:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s", &x, &y); ^