二次聯通門 : cogs 2569. [東方] 博麗靈夢 夢想妙珠

/*
    cogs 2569. [東方] 博麗靈夢 夢想妙珠

    莫隊水過。。
    
    好久沒一遍AC了。。
    
    卡線上榜2333 
*/
#include <algorithm>
#include <iostream>
#include <cstdio>
#include <cmath>

char Buf[100000001], *buf = Buf;
int BUF = 100000001;

void read (int &now)
{
    
 
for (now = 0; !isdigit (*buf); ++ buf);
    for (; isdigit (*buf); now = now * 10 + *buf - ‘0‘, ++ buf);
}

#define Max 100000

int belong[Max];

struct Data
{
    int l, r, c, Id;
    
    bool operator < (const Data &now) const
    {
        return belong[this->l] == belong[now.l] ? this->r < now.r : belong[this
 
->l] < belong[now.l];
    }
};

int count[Max << 1 | 1];

Data query[Max | 1];
int number[Max | 1];

int Answer[Max];

#define Cogs

int main (int argc, char *argv[])
{

#ifdef Cogs

    freopen ("mengxiangmiaozhu.in", "r", stdin);
    freopen ("mengxiangmiaozhu.out", "w", stdout);
    fread (buf, 
 
1, BUF, stdin);
    
#endif
    
    int N, M;
    read (N);
    register int i;
    int x;
    
    int K_Size = sqrt (N);
        
    for (i = 1; i <= N; ++ i)
        read (number[i]), belong[i] = (i + 1) / K_Size;
    
    read (M);
    
    for (i = 1; i <= M; ++ i)
    {
        read (query[i].l);
        read (query[i].r);
        read (query[i].c);
    }
    
    for (i = 1; i <= M; ++ i)
        query[i].Id = i;
        
    std :: sort (query + 1, query + 1 + M);
    
    int l = 1, r = 0;
    
    for (i = 1; i <= M; ++ i)
    {
        
        for (; l < query[i].l; -- count[number[l]], ++ l);
        for (; l > query[i].l; -- l, ++ count[number[l]]);
        for (; r < query[i].r; ++ r, ++ count[number[r]]);
        for (; r > query[i].r; -- count[number[r]], -- r);
        
        Answer[query[i].Id] = count[query[i].c];
    } 
    
    for (i = 1; i <= M; ++ i)
        printf ("%d\n", Answer[i]);
        
    return 0;
}

cogs 2569. [東方] 博麗靈夢 夢想妙珠