Compilare: user.cpp: In function ‘int main()’: user.cpp:47:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,printf("%d\n",sol.size());i<sol.size() && i<1000;++i) ^ user.cpp:18:33: 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:19:35: 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:21:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s",(A+1),(B+1)); ^