后缀数组 模板

原文地址：https://www.cnblogs.com/zwfymqz/p/8413523.html

#include
#include
#include
const int MAXN = 1e6 + 10;
using namespace std;
int N, M, rak[MAXN], sa[MAXN], tax[MAXN], tp[MAXN];
void Debug() {
    printf("*****************\n");
    printf("下标"); for (int i = 1; i <= N; i++) printf("%d ", i);     printf("\n");
    printf("sa  "); for (int i = 1; i <= N; i++) printf("%d ", sa[i]); printf("\n");
    printf("rak "); for (int i = 1; i <= N; i++) printf("%d ", rak[i]); printf("\n");
    printf("tp  "); for (int i = 1; i <= N; i++) printf("%d ", tp[i]); printf("\n");
}
void Qsort() {
    for (int i = 0; i <= M; i++) tax[i] = 0;
    for (int i = 1; i <= N; i++) tax[rak[i]]++;
    for (int i = 1; i <= M; i++) tax[i] += tax[i - 1];
    for (int i = N; i >= 1; i--) sa[ tax[rak[tp[i]]]-- ] = tp[i];
}
void SuffixSort(char s[]) {
    M = 75;
    for (int i = 1; i <= N; i++) rak[i] = s[i] - '0' + 1, tp[i] = i;
    Qsort();
    //Debug();
    for (int w = 1, p = 0; p < N; M = p, w <<= 1) {
        p = 0;
        for (int i = 1; i <= w; i++) tp[++p] = N - w + i;
        for (int i = 1; i <= N; i++) if (sa[i] > w) tp[++p] = sa[i] - w; 
        Qsort();
        std::swap(tp, rak);
        rak[sa[1]] = p = 1;
        for (int i = 2; i <= N; i++)
            rak[sa[i]] = (tp[sa[i - 1]] == tp[sa[i]] && tp[sa[i - 1] + w] == tp[sa[i] + w]) ? p : ++p;
        //Debug();
    }
}
int main() {
	char *s=(char*)malloc(sizeof(char)*MAXN);
    scanf("%s", s + 1);
    N = strlen(s + 1);
    SuffixSort(s);
    for (int i = 1; i <= N; i++)
        printf("%d ", sa[i]);
    return 0;
}