Compilare: user.cpp: In function ‘void Write(int, int, int)’: user.cpp:100:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < s[ul].size() - up; ++i ) ^ user.cpp: In function ‘void BuildPrefix(int)’: user.cpp:107:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i < s[x].size(); ++i ) ^ user.cpp: In function ‘void KMP(int, int)’: user.cpp:120:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < s[x].size(); ++i ) ^ user.cpp:126:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( k == s[y].size() - 1 ) ^ user.cpp: In function ‘void Solve()’: user.cpp:88:30: warning: ‘u’ may be used uninitialized in this function [-Wmaybe-uninitialized] Write((1 << N) - 1, u, 0); ^