Compilare: user.cpp: In function ‘int main()’: user.cpp:104:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pal2.in", "r", stdin); ^ user.cpp:105:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pal2.out", "w", stdout); ^ user.cpp:107:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", w + 1); ^ user.cpp: In function ‘void manacher()’: user.cpp:66:23: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int j = 2 * c - i; ^ user.cpp:95:9: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (i + d[i] > r) { ^ user.cpp:71:26: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] d[i] = j - l, T[i] = T[j]->get_father(d[j] - j + l); ^