Compilare: user.cpp: In function ‘void read()’: user.cpp:16:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000002]’ [-Wformat=] scanf("%s\n",&pattern); ^ user.cpp:17:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000002]’ [-Wformat=] scanf("%s",&s); ^ user.cpp: In function ‘void solve()’: user.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp: In function ‘void read()’: user.cpp:16:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",&pattern); ^ user.cpp:17:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s); ^ user.cpp: In function ‘int main()’: user.cpp:55:37: 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:56:39: 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); ^