UVA 4513

题目描述

#include 
#include 
#include 
#include 

using namespace std;
#define N 40000 + 10
#define x 123
typedef unsigned long long LL;

int m, len;
LL xp[N], H[N];
char s[N];
LL V[N];
LL mark;
int pos;

struct Haa
{
    LL v;
    int id;
}Ha[N];

int cmp(Haa a, Haa b)
{
    return (a.v == b.v) ? (a.id < b.id) : (a.v < b.v);
}

void init()
{
    xp[0] = 1;
    for(int i = 1; i <= len; i++) xp[i] = xp[i - 1] * x;
    H[len] = 0;
    for(int i = len - 1; i >= 0; i--) H[i] = H[i + 1] * x + (s[i] - 'a');
}

bool Find(int L)
{
    if(L > len) return false;
    pos = -1;
    int tmp = 0;
    for(int i = 0; i + L - 1 <= len - 1; i++)
    {
        Ha[i].id = i;
        Ha[i].v = H[i] - H[i + L] * xp[L];
    }
    sort(Ha, Ha + len - L + 1, cmp);

//    cout<<"L is : "<= m && Ha[i - 1].id > pos)
                    {
                        pos = Ha[i - 1].id;
                    }
                num = 1;
        }
    }

    if(num >= m && Ha[len - L].id > pos)
    {
        pos = Ha[len - L].id;
    }

    return pos >= 0;
}


int main()
{
    while(~scanf("%d", &m) && m)
    {
        scanf("%s", s);
        len = strlen(s);
        init();
        Find(1);
        int l = 0, r = len + 1;
        while(l + 1 < r)
        {
            int mid = (l + r) >> 1;
            if(Find(mid)) l = mid;
            else r = mid;
        }
        if(l == 0) printf("none\n");
        else {
                Find(l);
                printf("%d %d\n", l, pos);
        }
    }
    return 0;
}

/*

3
baaaababababbababbab
11
baaaababababbababbab
3
cccccc
2
babab
0

*/