Number Sequence
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Number Sequence
Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N <= 1000000). Your task is to find a number K which make a[K] = b[1], a[K + 1] = b[2], ...... , a[K + M - 1] = b[M]. If there are more than one K exist, output the smallest one.
213 51 2 1 2 3 1 2 3 1 3 2 1 21 2 3 1 313 51 2 1 2 3 1 2 3 1 3 2 1 21 2 3 2 1
6-1
代码详解:
#include<stdio.h>#include<iostream>using namespace std;int a[1000521],b[10521];int c[10521];//代表next数组//void getext(int *b, int m) { int i = 0, j = 0; c[0] = -1; j = c[i]; while(i < m) { if(j == -1 || b[i] == b[j]) { c[++i] = ++j; } else { j = c[j]; } }}//赋值c数组//int Kmp(int* a, int n, int* b, int m) { int i = 0, j = 0; while(i < n) { if(j == -1 || a[i] == b[j]){ ++i; ++j; if(j == m) { return i - m + 1; } } else { j = c[j]; } } return -1;}//找到重合的段//int main(){int T;cin >> T ;int N,M;while(T--){scanf("%d%d",&N,&M);for(int i = 0;i < N ;i++){scanf("%d",&a[i]);}for(int i = 0;i < M ;i++){scanf("%d",&b[i]);}getext(b,M);printf("%d\n",Kmp(a,N,b,M));}return 0;}
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