hihocoder#1513 : 小Hi的烦恼 bitset

Posted 2021-01-11 sssy

目录

• 题目链接
• 题解
• 代码

---

---

题目链接

hihocoder#1513 : 小Hi的烦恼

题解

cdq 套cdq 套cdq 套cdq就完了呀
对每一科开n个bitset 表示该科目前i个有谁
每次查询都&起来就好了

代码

#include<cstdio> 
#include<bitset> 
#include<cstring> 
#include<algorithm> 
#define LL long long 
#define gc getchar() 
#define pc putchar
inline int read() { 
    int x = 0,f = 1; 
    char c = gc; 
    while(c < '0' || c > '9' )c = gc; 
    while(c <= '9' && c >= '0') x = x * 10 + c - '0',c = gc; 
    return x * f ;
} 
void print(LL x) {
     if(x >= 10) print(x / 10); 
     pc(x % 10 + '0'); 
} 
const int maxn = 30007; 
std::bitset<maxn>b[6][maxn]; 
int a[maxn][6]; 
int rk[maxn]; 
int main() { 
    int n = read(); 
    for(int i = 1;i <= n;++ i) 
        for(int j = 1;j <= 5;++ j) { 
            a[i][j] = read();  
        } 
    for(int j = 1;j <= 5;++ j) { 
        for(int i = 1;i <= n;++ i) rk[a[i][j]] = i - 1; 
        for(int i = 1;i <= n;++ i) {
            b[j][i] = b[j][i - 1]; 
            b[j][i].set(rk[i]); 
        } 
    } 
    std::bitset<maxn>ans; 
    for(int i = 1;i <= n;++ i) { 
        ans.set(); 
        for(int j = 1;j <= 5;++ j) ans &= b[j][a[i][j] - 1];
        print(ans.count()); 
        pc('
'); 
    } 
    return 0;
}