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Re:Java 树状数组In Reply To:Java 树状数组 Posted by:zt990323 at 2019-05-16 15:54:01 > package poj_2352; > > import java.io.BufferedReader; > import java.io.BufferedWriter; > import java.io.IOException; > import java.io.InputStream; > import java.io.InputStreamReader; > import java.io.OutputStreamWriter; > import java.io.PrintWriter; > import java.io.StreamTokenizer; > > public class Main { > public static final int max=40000; > public static int[] c=new int[max]; > > public static int lowbit(int x) { > return x&(-x); > } > > public static void add(int x,int y) { > for(int i=x;i<=max;i+=lowbit(i)) > c[i]+=y; > } > > public static int ask(int x) { > int ans=0; > > for(int i=x;i>0;i-=lowbit(i)) > ans+=c[i]; > > return ans; > } > > public static void main(String[] args) throws NumberFormatException, IOException { > InputReader sc=new InputReader(System.in); > PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out))); > int n=sc.nextInt(); > int[] res=new int[n]; > > for(int i=0;i<n;i++) { > int x=sc.nextInt()+1; > int y=sc.nextInt(); > int temp=ask(x); > res[temp]++; > add(x,1); > } > for(int i=0;i<n;i++) > out.println(res[i]); > out.flush(); > } > } > > > class InputReader{ > StreamTokenizer sc; > > public InputReader(InputStream stream) { > sc=new StreamTokenizer(new BufferedReader(new InputStreamReader(stream))); > sc.ordinaryChars(33,126); > sc.wordChars(33,126); > } > > public String next() throws IOException { > sc.nextToken(); > return sc.sval; > } > > public int nextInt() throws NumberFormatException, IOException { > return Integer.parseInt(next()); > } > > public long nextLong() throws NumberFormatException, IOException { > return Long.parseLong(next()); > } > > public boolean hasNext() throws IOException { > int res=sc.nextToken(); > sc.pushBack(); > return res!=sc.TT_EOF; > } > } Followed by: Post your reply here: |
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