Compilare: user.cpp: In function ‘int main()’: user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.length(); ++i) ^ user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < t.length(); ++i) ^ user.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i+pal[i] < t.length() && t[i+pal[i]] == t[i-pal[i]]) ^ user.cpp:21:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld.in","r",stdin); ^ user.cpp:22:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld.out","w",stdout); ^