poj 2127 lcis wa

#include<iostream>
#include<cstdio>
#include<stack>
#include<algorithm>
#include<cstring>

using namespace std;

typedef long long ll;
const int maxn = 505;
const ll one = 1;
const ll inf = one << 32;
ll n1, n2, a[maxn], b[maxn];
ll l[maxn][maxn];
struct xx{
    int i, j;
}pre[maxn][maxn], ind[maxn];

int insert_(ll *la, int p, int i, int j, ll e){
    while(la[p] < e) p++;
    la[p]=e;
    ind[p]=(xx){i, j};
    if(p) pre[i][j]=ind[p-1];
    return p;
}

void lcis(){
    int i, j, x, p=0;
    for(i=0; i<n2; i++)
        fill_n(l[i], n2, inf);

    memset(pre, -1, sizeof(pre));

    for(i=0; i<n1; i++){
        x=-1, p=0;
        for(j=0; j<n2; j++){
            if(a[i]==b[j]) x=p=insert_(l[j], p, i, j, a[i]);
            else{
                if(x!=-1 && l[j][x]>l[j-1][x]) l[j][x]=l[j-1][x];
                else x=-1;
            }
        }
    }
}

void print(){
    int t, j, i;
    for(j=n2-1; j>-1; j--) if(l[n2-1][j]!=inf)
        break;
    stack<ll> s;
    printf("%d\n", j+1);
    i = ind[j].i;   j=ind[j].j;
    while(i > -1){
        s.push(a[i]);
        t=pre[i][j].i;  j=pre[i][j].j;
        i=t;
    }
    while(!s.empty()){
        printf("%lld", s.top());  s.pop();
        printf("%c", s.empty()?‘\n‘:‘ ‘);
    }
}

int main(){
    while(scanf(" %lld", &n1)==1){
        for(int i=0; i<n1; i++) scanf(" %lld", a+i);
        scanf(" %lld", &n2);
        for(int i=0; i<n2; i++) scanf(" %lld", b+i);
        lcis();
        print();
    }
    return 0;
}