hdu1711 Number Sequence
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今天学了下KMP算法,差不多理解咯,这题只要套一下模板就可以ko。昨天看了下最小表示法算法。看到中间头晕咯。相当无语,到现在还没懂。
include<iostream>
using namespace std;
const int maxn=1000005;
const int maxm=10005;
int a[maxn],b[maxm],next[maxm];
int n,m;
void getNext(int *p, int m, int *next) {
int i = 0, j = next[0] = -1;
while(i < m) {
if (j == -1 || p[i] == p[j]) {
// next[++i] = ++j; // Morris & Pratt¦Ì???¡¤¡§
++i; ++j;
next[i] = p[i] != p[j] ? j:next[j]; // Knuth¦Ì?????
} else
j = next[j];
}//while
//for(i=0; i<=m; i++)printf("next[%d]=%d/n",i,next[i]);//D¡ê?¨¦
}//
int kmpIndex(int pos) {
int i = pos, j = 0;
while(i < n && j < m) {
if (j == -1 || a[i] == b[j]) ++i, ++j;
else j = next[j];
}///while
//return j >= m ? (i-m):-1;
return j>=m?(i-m+1):-1;
}
int main()
{
int T,i,j;
cin>>T;
while(T--)
{
cin>>n>>m;
for(i=0;i<n;i++)
cin>>a[i];
for(i=0;i<m;i++)
cin>>b[i];
getNext(b,m,next);
int ans=kmpIndex(0);
cout<<ans<<endl;
}
return 0;
}
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