Compilare: user.cpp: In function ‘int main()’: user.cpp:25:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i=1 ; i <= s.size() ; ++i ) ^ user.cpp:31:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( ; i-DIM[0][i]-1 >= 1 && i+DIM[0][i]+1 <= s.size() && s[i-DIM[0][i]-2] == s[i+DIM[0][i]] ; ++DIM[0][i]); ^ user.cpp:39:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( ; i-DIM[1][i] >= 1 && i+DIM[1][i]+1 <= s.size() && s[i-DIM[1][i]-1] == s[i+DIM[1][i]] ; ++DIM[1][i]); ^ user.cpp:19:37: 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); ^