【luogu P4113 [HEOI2012]采花】 假题解

题目链接：https://www.luogu.org/problemnew/show/P4113

为什么要卡莫队！为什么加强的这么毒瘤！

莫队可以拿100分剩下三个点没治了

// luogu-judger-enable-o2
#include <cmath>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#define ri register
#define il inline
using namespace std;
const int maxn = 1000001;
inline int read()
{
    int k=0;
    char c;
    c=getchar();
    while(!isdigit(c))c=getchar();
    while(isdigit(c)){k=(k<<3)+(k<<1)+c-'0';c=getchar();}
    return k;
}
int n, m, c, answer, bl, curL = 1, curR = 0;
int a[maxn], cnt[maxn], ans[maxn];
struct Query{
    int l, r, p;
    friend bool operator < (const Query &a, const Query &b)
    {
        return (a.l/bl) == (b.l/bl) ? a.r < b.r : a.l < b.l;
    }
}q[maxn];
il void add(int pos)
{
    ++cnt[a[pos]];
    if(cnt[a[pos]] == 2) answer++;
}
il void del(int pos)
{
    --cnt[a[pos]];
    if(cnt[a[pos]] == 1) answer--;
}
int main()
{
    n = read(); c = read(); m = read();
    bl = sqrt(n);
    for(ri int i = 1; i <= n; i++)
    a[i] = read();

    for(ri int i = 1; i <= m; i++)
    {
        int l,r;
        l = read(); r = read();
        q[i].l = l;
        q[i].r = r;
        q[i].p = i;
    }
    sort(q+1,q+1+m);
    for(ri int i = 1; i <= m; i++)
    {
        int L = q[i].l, R = q[i].r;
        while(curL < L) del(curL++);
        while(curL > L) add(--curL);
        while(curR < R) add(++curR);
        while(curR > R) del(curR--);
        ans[q[i].p] = answer;
    }
    for(int i = 1; i <= m; i++)
    printf("%d\n",ans[i]);
    return 0;
}