# Ural 1297 palindrome (longest echo substring)

Source: Internet
Author: User

This topic is now linear with manacherAlgorithmWrite, suffix array version has not been implemented, it is planned to be done in two days

I still think it is both easy to write and fast to solve the retrieval problem.

`# Include <iostream> # include <string. h> # include <stdio. h> using namespace STD; # define min (a, B) (a <B? A: B) Char STR [2500]; char rec [2500]; int Drome [2500]; int main () {int I, j, k; int max_pos, Pos; while (scanf ("% s", REC )! = EOF) {k = 0; STR [k ++] = '@'; for (I = 0; REC [I]; I ++) {STR [k ++] = '#'; STR [k ++] = rec [I];} STR [k ++] = '#'; STR [k] = 0; Drome [0] = 1; max_pos = 0; Pos = 0; for (I = 1; STR [I]; I ++) {If (max_pos> I) {Drome [I] = min (Drome [POS * 2-I], max_pos-i);} else Drome [I] = 1; (; STR [I + Drome [I] = STR [I-Drome [I]; Drome [I] ++); if (I + Drome [I]> max_pos) pos = I, max_pos = Drome [I] + I;} max_pos =-1; Pos = 0; For (j = 0; j <I; j ++) {If (Drome [J]> max_pos) {Max_pos = Drome [J]; Pos = J ;}// printf ("MAX: % d \ n", max_pos); max_pos; k = pos-max_pos + 1; pos + = max_pos-1; For (K; k <Pos; k ++) if (STR [k]! = '#') Printf ("% C", STR [k]); printf ("\ n");} return 0 ;}`
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