hdu 5008 Boring String Problem 【后缀数组】

#pragma comment(linker, "/STACK:102400000,102400000")
#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
#include<queue>
#include<stack>
#include<string>
#include<map>
#include<set>
#include<cmath>
#include<cassert>
#include<cstring>
#include<iomanip>
using namespace std;
#ifdef _WIN32
#define i64 __int64
#define out64 "%I64d\len"
#define in64 "%I64d"
#else
#define i64 long long
#define out64 "%lld\len"
#define in64 "%lld"
#endif
/************ for topcoder by zz1215 *******************/
#define foreach(c,itr)  for(__typeof((c).begin()) itr=(c).begin();itr!=(c).end();itr++)
#define FOR(i,a,b)      for( int i = (a) ; i <= (b) ; i ++)
#define FF(i,a)         for( int i = 0 ; i < (a) ; i ++)
#define FFD(i,a,b)      for( int i = (a) ; i >= (b) ; i --)
#define S64(a)          scanf(in64,&a)
#define SS(a)           scanf("%d",&a)
#define LL(a)           ((a)<<1)
#define RR(a)           (((a)<<1)+1)
#define pb              push_back
#define pf              push_front
#define X               first
#define Y               second
#define CL(Q)           while(!Q.empty())Q.pop()
#define MM(name,what)   memset(name,what,sizeof(name))
#define MC(a,b)			memcpy(a,b,sizeof(b))
#define MAX(a,b)        ((a)>(b)?(a):(b))
#define MIN(a,b)        ((a)<(b)?(a):(b))
#define read            freopen("out.txt","r",stdin)
#define write           freopen("out2.txt","w",stdout)

const int inf = 0x3f3f3f3f;
const i64 inf64 = 0x3f3f3f3f3f3f3f3fLL;
const double oo = 10e9;
const double eps = 10e-6;
const double pi = acos(-1.0);
const int maxn = 101234;

char c[maxn];

int sa[maxn];  // 1~len 有效
int rk[maxn];   //  0~len-1 有效
int height[maxn];  // 2~len 有效

int wa[maxn], wb[maxn], wc[maxn], wd[maxn];

int cmp(int *r, int a, int b, int l){
	return r[a] == r[b] && r[a + l] == r[b + l];
}

void da(char *r, int *sa, int len, int maxc){
	r[len++] = 0;
	int i, j, p, *x = wa, *y = wb, *t;
	for (i = 0; i<maxc; i++) wd[i] = 0;
	for (i = 0; i<len; i++) wd[x[i] = r[i]]++;
	for (i = 1; i<maxc; i++) wd[i] += wd[i - 1];
	for (i = len - 1; i >= 0; i--) sa[--wd[x[i]]] = i;
	for (j = 1, p = 1; p<len; j *= 2, maxc = p)
	{
		for (p = 0, i = len - j; i<len; i++) y[p++] = i;
		for (i = 0; i<len; i++) if (sa[i] >= j) y[p++] = sa[i] - j;
		for (i = 0; i<len; i++) wc[i] = x[y[i]];
		for (i = 0; i<maxc; i++) wd[i] = 0;
		for (i = 0; i<len; i++) wd[wc[i]]++;
		for (i = 1; i<maxc; i++) wd[i] += wd[i - 1];
		for (i = len - 1; i >= 0; i--) sa[--wd[wc[i]]] = y[i];
		for (t = x, x = y, y = t, p = 1, x[sa[0]] = 0, i = 1; i < len; i++){
			x[sa[i]] = cmp(y, sa[i - 1], sa[i], j) ? p - 1 : p++;
		}
	}
	return;
}

void get_height(char *r, int *sa, int len){
	int i, j, k = 0;
	for (i = 1; i <= len; i++) rk[sa[i]] = i;
	for (i = 0; i < len; height[rk[i++]] = k){
		for (k ? k-- : 0, j = sa[rk[i] - 1]; r[i + k] == r[j + k]; k++);
	}
	return;
}

int n;
i64 have[maxn];
i64 hs[maxn];

int qsa[20][maxn];
int qh[20][maxn];
int lg2[maxn];

void init_rmq(int st[][maxn],int l,int r){   //从 l 到 r 初始化rmq
	for (int step = 1; (1 << step) <= r; step++){
		for (int i = l; i <= r; i++){
			if (i + (1 << (step - 1)) <= r){
				st[step][i] = 
					min //最小查询
					//max //最大查询
					(st[step - 1][i], st[step - 1][i + (1 << (step - 1))]);
			}
			else{
				st[step][i] = st[step - 1][i];
			}
		}
	}
}

int query(int st[][maxn], int l, int r){  //查询 l 到 r 的结果
	return
		min  //最小查询
		//max  //最大查询
		(st[lg2[r - l + 1]][l], st[lg2[r - l + 1]][r - (1 << lg2[r - l + 1]) + 1]); 
}

void start(){
	da(c, sa, n, 128);
	get_height(c, sa, n);
	for (int i = 1; i <= n; i++){
		have[i] = n - sa[i] - height[i];
	}
	hs[0] = 0;
	for (int i = 1; i <= n; i++){
		hs[i] = hs[i - 1] + have[i];
	}
	for (int i = 1; i <= n; i++){
		qsa[0][i] = sa[i];
		qh[0][i] = height[i];
	}
	init_rmq(qsa, 1, n);
	init_rmq(qh, 2, n);
}

int find(i64 k,int len){
	if (k > hs[len]){
		return -1;
	}
	else{
		int l,r;
		l = 1; r = len;
		while (l < r){
			int mid = (l + r) / 2;
			if (hs[mid] >= k){
				r = mid;
			}
			else{
				l = mid + 1;
			}
		}
		return l;
	}
}

int findsal(int pos,int hh){
	int l = 1;
	int r = pos;
	while (l < r){
		int mid = (l + r) / 2;
		int temp = query(qh, mid + 1, pos);
		if (temp >= hh) {
			r = mid;
		}
		else{
			l = mid + 1;
		}
	}
	return l;
}

int findsar(int pos, int hh){
	int l = pos;
	int r = n;
	while (l < r){
		int mid = (l + r + 1) / 2;
		int temp = query(qh, pos + 1, mid);
		if (temp >= hh){
			l = mid;
		}
		else{
			r = mid - 1;
		}
	}
	return r;
}

int main(){
	for (int i = 1; i < 20; i++){
		if ((1 << i) < maxn){
			lg2[(1 << i)] = i;
		}
	}
	for (int i = 3; i < maxn; i++){ 
		if (lg2[i] == 0){
			lg2[i] = lg2[i - 1];
		}
	}
	while (scanf("%s",c)!=EOF){
		n = strlen(c);
		start();
		int Q;
		cin >> Q;
		i64 l, r;
		i64 k, v;
		l = r = 0;
		for (int i = 1; i <= Q; i++){
			//cin >> v;
			scanf("%I64d", &v);
			k = (l ^ r ^ v)+1;
			int pos = find(k,n);
			if (pos != -1){
				l = sa[pos];
				r = n - (hs[pos] - k)-1;
				int hh = r - l + 1;
				int ansl = query(qsa, findsal(pos,hh) , findsar(pos, hh)) + 1;
				int ansr = ansl + hh - 1;
				l = ansl;
				r = ansr;
				printf("%d %d\n", ansl, ansr);
			}
			else{
				puts("0 0");
				l = r = 0;
			}
		}
	}
	return 0;
}