POJ2945：Find the Clones——题解

http://poj.org/problem?id=2945

还是trie树……对于结束标记累加并且开个数组记录一下即可。

#include<cstdio>
#include<cstring>
using namespace std;
struct node{
    int ed;
    int son[4];
    void clear(){
    memset(son,0,sizeof(son));
    ed=0;
    }
}tree[500050];
inline int turn(char ch){
    if(ch=='A')return 0;
    if(ch=='C')return 1;
    if(ch=='G')return 2;
    return 3;
}
char s[20050][25];
int t[20001];
int tot;
int n,m;
void insert(int k){
    int l=m;
    int now=1;
    for(int i=0;i<l;i++){
    if(tree[now].son[turn(s[k][i])]==0){
        tot++;
        tree[now].son[turn(s[k][i])]=tot;
    }
    now=tree[now].son[turn(s[k][i])];
    }
    t[tree[now].ed]--;
    tree[now].ed++;
    t[tree[now].ed]++;
    return;
}
int main(){
    while(scanf("%d%d",&n,&m)!=EOF&&(m!=n&&n!=0)){
    for(int i=1;i<=500049;i++)tree[i].clear();
    tot=1;
    memset(t,0,sizeof(t));
    for(int i=1;i<=n;i++){
        char ch=0;int j=0;
        while(ch<'A'||ch>'Z')ch=getchar();
        while(ch>='A'&&ch<='Z'){s[i][j]=ch;ch=getchar();j++;}
        insert(i);
    }
    for(int i=1;i<=n;i++){
        printf("%d\n",t[i]);
    }
    }
    return 0;
}