后缀数组(模版测试中)

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_39942341/article/details/82557974

倍增法 

#include<iostream>
#include<cstring>
const int N = 1e5 + 5;
char s[N];
int sa[N], ra[N], wa[N], wb[N], wv[N], ws[N], height[N], next[N], n;
bool cmp(const int *f, const int &a, const int &b, const int &j) {
	return f[a] == f[b] && f[a + j] == f[b + j];
}
void getSA() {
	int *x = wa, *y = wb, m = 128;
	memset(ws, 0, sizeof(ws));
	for (int i = 0; i < n; ++i)++ws[x[i] = s[i]];
	for (int i = 1; i < m; ++i)ws[i] += ws[i - 1];
	for (int i = n - 1; i >= 0; --i)sa[--ws[x[i]]] = i;
	for (int j = 1, p = 1; p < n; j <<= 1, m = p) {
		p = 0;
		for (int i = n - j; i < n; ++i)y[p++] = i;
		for (int i = 0; i < n; ++i)if (sa[i] >= j)y[p++] = sa[i] - j;
		memset(ws, 0, sizeof(ws));
		for (int i = 0; i < n; ++i)wv[i] = x[y[i]];
		for (int i = 0; i < n; ++i)++ws[wv[i]];
		for (int i = 1; i < m; ++i)ws[i] += ws[i - 1];
		for (int i = n - 1; i >= 0; --i)sa[--ws[wv[i]]] = y[i];
		std::swap(x, y);
		p = 1;
		x[sa[0]] = 0;
		for (int i = 1; i < n; ++i)
			x[sa[i]] = cmp(y, sa[i], sa[i - 1], j) ? p - 1 : p++;
	}
}
void getHeight() {
	for (int i = 0; i < n; ++i)ra[sa[i]] = i;
	int k = 0;
	memset(height, 0, sizeof(height));
	for (int i = 0; i < n; height[ra[i++]] = k) {
		if (k)--k;
		for (int j = sa[ra[i] - 1]; i + k < n&&j + k < n&&s[i + k] == s[j + k]; ++k);
	}
}