Compilare: user.cpp: In function ‘int main()’: user.cpp:43:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000004]’ [-Wformat=] scanf("%s %s", &a, &b); ^ user.cpp:43:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2000004]’ [-Wformat=] user.cpp:65:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) ^ user.cpp:66:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout<<sol[i]<<" \n"[i==sol.size()]; ^ user.cpp:41:39: 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:42:41: 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:43:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s", &a, &b); ^