Compilare: user.cpp: In function ‘int main()’: user.cpp:35:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= b.size(); i ++) { ^ user.cpp:45:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= b.size() - a.size(); i ++) { ^ user.cpp:53:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= b.size(); i ++) { ^ 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); ^