Compilare: user.cpp: In function ‘int main()’: user.cpp:24:24: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000009]’ [-Wformat=] scanf("%s %s",&a,&b); ^ user.cpp:24:24: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2000009]’ [-Wformat=] user.cpp:22:37: 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:23:39: 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:24:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s",&a,&b); ^