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  • HDU-1541 POJ-2352 Stars

     1 #include <iostream>
     2 #include <cstring>
     3 #define pb push_back
     4 #define _for(i,a,b) for(int i = (a);i < (b);i ++)
     5 #define INF 0x3f3f3f3f
     6 #define sz size()
     7 
     8 using namespace std;
     9 typedef long long ll;
    10 
    11 const int maxn = 1 << 18;
    12 
    13 int n, dat[2*maxn];
    14 
    15 void init(int n_)
    16 {
    17     n = (1 << 18)-2;
    18     memset(dat,0,sizeof(dat));
    19 }
    20 
    21 //更新第k(0-index)个值为a
    22 void update(int k)
    23 {
    24     k += n+1;
    25     dat[k] ++;
    26     while(k>0)
    27     {
    28         k = (k-1)/2;
    29         dat[k] = dat[k*2+1]+dat[k*2+2];
    30     }
    31 }
    32 
    33 //求(a,b)val
    34 //query(a,b,0,0,n)
    35 int query(int a,int b,int k,int l,int r)
    36 {
    37     //不相交
    38     if(r<a || b<l) return 0;
    39 
    40     if(a<=l && r<=b) {return dat[k];}
    41     else
    42     {
    43         int vl = query(a,b,k*2+1,l,(l+r)/2);
    44         int vr = query(a,b,k*2+2,(l+r)/2+1,r);
    45         
    46         return vl+vr;
    47     }
    48     return -1;//error
    49 }
    50 
    51 int readint()
    52 {
    53     int t;
    54     scanf("%d",&t);
    55     return t;
    56 }
    57 
    58 int main()
    59 {
    60     int N;
    61     while(scanf("%d",&N)!=EOF)
    62     {
    63         init(n);
    64         int rnt[15002];
    65         memset(rnt,0,sizeof(rnt));
    66         _for(i,0,N)
    67         {
    68             int x = readint();
    69             rnt[query(0,x,0,0,n)] ++;
    70             update(x);
    71             readint();
    72         }
    73         _for(i,0,N)
    74             printf("%d
    ",rnt[i]);
    75     }
    76     return 0;
    77 }
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  • 原文地址:https://www.cnblogs.com/Asurudo/p/10658867.html
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