Compilare: user.cpp: In function ‘int main()’: user.cpp:56:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<one.size();++i) good[one[i]]=true; ^ user.cpp:60:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<two.size();++i) if (good[two[i]]) one.push_back(two[i]); ^ user.cpp:62:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,printf("%d\n",one.size());i<one.size() && i<1000;++i) ^ user.cpp:49:33: 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:50:35: 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:52:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s",(A+1),(B+1)); ^