luogu2178 [NOI2015]品酒大会

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挺神仙的……

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#include <algorithm>
#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;
typedef long long ll;
int n, a[300005], rnk[300005], cnt[300005], tmp[300005], p, m=128, hei[300005], mx[300005], mn[300005];
int fa[300005], siz[300005], saa[300005];
ll ans[300005], sum[300005];
char ss[300005];
struct Node{
int h, x, y;
}nd[300005];
int myfind(int x){
return fa[x]==x?x:fa[x]=myfind(fa[x]);
}
void sasort(){
for(int i=0; i<m; i++) cnt[i] = 0;
for(int i=0; i<n; i++) cnt[rnk[i]]++;
for(int i=1; i<m; i++) cnt[i] += cnt[i-1];
for(int i=n-1; i>=0; i--) saa[--cnt[rnk[tmp[i]]]] = tmp[i];
}
void buildSA(){
ss[n++] = 0;
for(int i=0; i<n; i++){
rnk[i] = ss[i];
tmp[i] = i;
}
sasort();
for(int j=1; p<n; j<<=1){
p = 0;
for(int i=n-j; i<n; i++) tmp[p++] = i;
for(int i=0; i<n; i++)
if(saa[i]>=j)
tmp[p++] = saa[i] - j;
sasort();
swap(rnk, tmp);
rnk[saa[0]] = 0;
p = 1;
for(int i=1; i<n; i++)
if(tmp[saa[i]]==tmp[saa[i-1]] && tmp[saa[i]+j]==tmp[saa[i-1]+j])
rnk[saa[i]] = p - 1;
else
rnk[saa[i]] = p++;
m = p;
}
n--;
}
void getLcp(){
for(int i=1; i<=n; i++) rnk[saa[i]] = i;
int h=0;
for(int i=0; i<n; i++){
if(h) h--;
int j=saa[rnk[i]-1];
while(ss[i+h]==ss[j+h]) h++;
hei[rnk[i]] = h;
}
}
bool cmp(Node a, Node b){
return a.h>b.h;
}
int main(){
cin>>n;
scanf("%s", ss);
for(int i=1; i<=n; i++) scanf("%d", &a[i]);
buildSA();
getLcp();
for(int i=1; i<=n; i++){
fa[i] = i;
mx[rnk[i-1]] = mn[rnk[i-1]] = a[i];
siz[i] = 1;
}
for(int i=2; i<=n; i++)
nd[i-1] = (Node){hei[i], i, i-1};
memset(sum, 128, sizeof(sum));
int j=1;
sort(nd+1, nd+n, cmp);
for(int i=nd[1].h; i>=0; i--){
ans[i] = ans[i+1]; sum[i] = sum[i+1];
for(; j<n && nd[j].h==i; j++){
int x=myfind(nd[j].x), y=myfind(nd[j].y);
sum[i] = max(sum[i], (ll)mx[x]*mx[y]);
sum[i] = max(sum[i], (ll)mn[x]*mn[y]);
ans[i] += (ll)siz[x] * siz[y];
fa[y] = x; siz[x] += siz[y];
mx[x] = max(mx[x], mx[y]); mn[x] = min(mn[x], mn[y]);
}
}
for(int i=0; i<n; i++)
printf("%lld %lld\n", ans[i], ans[i]?sum[i]:0);
return 0;
}