mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
95 lines
2.1 KiB
C++
95 lines
2.1 KiB
C++
#include<cstdio>
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#include<algorithm>
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#include<cstring>
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const int MAXN=40000+5;
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const int SIGMA_SIZE=26;
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const int INF=~0U>>1;
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struct State{
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State* go[SIGMA_SIZE],*suf;
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int val,cnt,right;
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State():suf(0) {val=cnt=0;memset(go,0,sizeof go);}
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}*root,*last;
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State mem[MAXN<<1],*cur;
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int ans1,ans2;
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int m;
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inline void init()
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{
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ans1=-1;
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cur=mem;
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mem[0]=State();
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last=root=cur++;
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}
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inline void extend(int w)
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{
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State* p=last,*np=cur++;
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*np=State();
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np->right=np->val=p->val+1;
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while(p && !p->go[w]) p->go[w]=np,p=p->suf;
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if(!p) np->suf=root;
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else
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{
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State* q=p->go[w];
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if(q->val==p->val+1) np->suf=q;
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else
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{
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State* nq=cur++;
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*nq=State();
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memcpy(nq->go,q->go,sizeof q->go);
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nq->right=nq->val=p->val+1;
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nq->suf=q->suf;
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q->suf=np->suf=nq;
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while(p && p->go[w]==q) p->go[w]=nq,p=p->suf;
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}
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}
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last=np;
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}
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inline int idx(char c)
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{
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return c-'a';
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}
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char s[MAXN];
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int n;
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State* pt[MAXN<<1];
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void work()
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{
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static int ws[MAXN<<1];
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State* t;
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for(int i=0;i<=n;++i) ws[i]=0;
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for(t=mem+1;t!=cur;++t) ++ws[t->val];
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for(int i=1;i<=n;++i) ws[i]+=ws[i-1];
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for(t=cur-1;t!=mem;--t) pt[--ws[t->val]]=t;
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t=root;
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for(int i=0;i<n;++i) t=t->go[idx(s[i])],t->cnt++;
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for(int i=cur-mem-2;i>=0;--i)
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{
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State* u=pt[i];
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if(u->cnt>=m)
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{
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if(u->val>ans1) ans1=u->val,ans2=u->right-u->val;
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else if(u->val==ans1) ans2=std::max(ans2,u->right-u->val);
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}
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if(u->suf)
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u->suf->cnt+=u->cnt,u->suf->right=std::max(u->suf->right,u->right);
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}
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}
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int main()
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{
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while(scanf("%d",&m)!=EOF && m)
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{
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init();
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scanf("%s",s);
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n=strlen(s);
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if(m==1)
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{
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printf("%d 0\n",n);
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continue;
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}
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for(int i=0;i<n;++i)
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extend(idx(s[i]));
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work();
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if(ans1==-1) puts("none");
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else printf("%d %d\n",ans1,ans2);
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}
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return 0;
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}
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