Hihocoder #1513 : 小Hi的烦恼

#1513 : 小Hi的烦恼

https://hihocoder.com/problemset/problem/1513

分析:

  bitset,五维数点问题。

  记录每一科的第i名前面有那些人,最后&起来就行了。

代码;

复杂度$O(k n^2/64)$,k为维数。

 1 #include<cstdio>
 2 #include<algorithm>
 3 #include<cstring>
 4 #include<cmath>
 5 #include<iostream>
 6 #include<cctype>
 7 #include<set>
 8 #include<vector>
 9 #include<queue>
10 #include<map>
11 #include<bitset>
12 #define fi(s) freopen(s,"r",stdin);
13 #define fo(s) freopen(s,"w",stdout);
14 using namespace std;
15 typedef long long LL;
16 
17 inline int read() {
18     int x=0,f=1;char ch=getchar();for(;!isdigit(ch);ch=getchar())if(ch=='-')f=-1;
19     for(;isdigit(ch);ch=getchar())x=x*10+ch-'0';return x*f;
20 }
21 
22 const int N = 30001;
23 bitset<N> f[5][N], tmp;
24 int rnk[N][5], ord[N];
25 // rnk[i][j] 第i人的第j科的排名。 ord[i] 当前这一科中,排名为i的是谁。 
26 int main() {
27     int n = read();
28     for (int i=1; i<=n; ++i) 
29         for (int j=0; j<5; ++j) rnk[i][j] = read();
30     for (int j=0; j<5; ++j) { 
31         for (int i=1; i<=n; ++i) ord[rnk[i][j]] = i - 1;
32         for (int i=1; i<=n; ++i) {
33             f[j][i] = f[j][i - 1];
34             f[j][i].set(ord[i]);
35         }
36     }
37     for (int i=1; i<=n; ++i) {
38         tmp.set();
39         for (int j=0; j<5; ++j) tmp &= f[j][rnk[i][j] - 1];
40         printf("%d\n",tmp.count());
41     }
42     return 0;
43 }

 

分块打表,$O(k n \sqrt n / 64)$

 1 #include<cstdio>
 2 #include<algorithm>
 3 #include<cstring>
 4 #include<cmath>
 5 #include<iostream>
 6 #include<cctype>
 7 #include<set>
 8 #include<vector>
 9 #include<queue>
10 #include<map>
11 #include<bitset>
12 #define fi(s) freopen(s,"r",stdin);
13 #define fo(s) freopen(s,"w",stdout);
14 using namespace std;
15 typedef long long LL;
16 
17 inline int read() {
18     int x=0,f=1;char ch=getchar();for(;!isdigit(ch);ch=getchar())if(ch=='-')f=-1;
19     for(;isdigit(ch);ch=getchar())x=x*10+ch-'0';return x*f;
20 }
21 
22 const int N = 30001;
23 bitset<N> f[5][175], g[5], tmp;
24 int rnk[N][5], ord[5][N], bel[N], pos[N];
25 
26 void add(int j,int l,int r) {
27     for (int i=l; i<=r; ++i) g[j].set(ord[j][i]);
28 }
29 
30 int main() { 
31     int n = read();
32     for (int i=1; i<=n; ++i) 
33         for (int j=0; j<5; ++j) 
34             rnk[i][j] = read(), ord[j][rnk[i][j]] = i - 1;
35     
36     int B = sqrt(n);
37     for (int j=0; j<5; ++j) { 
38         int p = 1;
39         for (int i=1; i<=n; i+=B,++p) 
40             for (int k=1; k<=i; ++k) f[j][p].set(ord[j][k]);
41     }
42     for (int x,i=1; i<=n; ++i) {
43         if ((i - 1) % B == 0) x = (i - 1) / B + 1, pos[x] = i;
44         bel[i] = x;
45     }
46     for (int i=1; i<=n; ++i) {
47         tmp.set();
48         for (int j=0; j<5; ++j) {
49             int t = rnk[i][j] - 1;
50             g[j] = f[j][bel[t]];
51             if (pos[bel[t]] < t) add(j, pos[bel[t]] + 1, t);
52             tmp &= g[j];
53         }
54         printf("%d\n",tmp.count());
55     }
56     return 0;
57 }

 

posted @ 2018-10-09 14:29  MJT12044  阅读(268)  评论(2编辑  收藏  举报