HDU 1711 Number Sequence
2016-08-25 15:57
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模板题
题意为:找出b数组在a数组出现的第一个地方,否则输出-1#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#include<stack>
#include<queue>
#include<vector>
using namespace std;
#define LL long long int
#define N 1000005
#define MAX (1<<31)-1
int A
,B
;
void kmp_pre(int x[],int m,int next[]){
int i=0,j=next[0]=-1;
while(i<m){
if(j==-1||x[i]==x[j]) next[++i]=++j;
else j=next[j];
}
}
int KMP_Count(int x[],int m,int y[],int n){
int i=0,j=0,next
,ans=0;
kmp_pre(x,m,next);
while(i<n){
if(j==-1||x[j]==y[i]) i++,j++;
else j=next[j];
if(j>=m) return i-m+1;
}
return -1;
}
int main(){
int T,n,m;
scanf("%d",&T);
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]);
printf("%d\n",KMP_Count(B,m,A,n));
}
return 0;
}
题意为:找出b数组在a数组出现的第一个地方,否则输出-1#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#include<stack>
#include<queue>
#include<vector>
using namespace std;
#define LL long long int
#define N 1000005
#define MAX (1<<31)-1
int A
,B
;
void kmp_pre(int x[],int m,int next[]){
int i=0,j=next[0]=-1;
while(i<m){
if(j==-1||x[i]==x[j]) next[++i]=++j;
else j=next[j];
}
}
int KMP_Count(int x[],int m,int y[],int n){
int i=0,j=0,next
,ans=0;
kmp_pre(x,m,next);
while(i<n){
if(j==-1||x[j]==y[i]) i++,j++;
else j=next[j];
if(j>=m) return i-m+1;
}
return -1;
}
int main(){
int T,n,m;
scanf("%d",&T);
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]);
printf("%d\n",KMP_Count(B,m,A,n));
}
return 0;
}
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