Submission #1305860

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Source Code Expand

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scan = new Scanner(System.in);
		int N=scan.nextInt();
		int[][] box = new int[N][2];
		for(int i=0;i<N;i++){
			box[i][0]=scan.nextInt();
			box[i][1]=scan.nextInt();
		}

		Arrays.sort(box,new ArraySort());

		final int INF = 1000000000;
		int dp[] = new int[N+1];//dp[i] = 単調増加の部分列i を作るのに最小の最後尾の数
								//次の数a[i]について、dp[j]<a[i]<dp[j+1]であればdp[j+1]=a[i]
		for(int i=0;i<N+1;i++){
			dp[i]=INF;
		}
		for(int i=0;i<N;i++){
			int result = Arrays.binarySearch(dp,box[i][1]);
			int insertionPoint = (result>=0) ? result : ~result;
			dp[insertionPoint] =box[i][1];
		}

		for(int i=0;i<N;i++){
			if(dp[i+1]==INF){
				System.out.println(i+1);
				break;
			}
		}


	}

}


class ArraySort implements Comparator<int[]>{
	public int compare(int[] num1,int[] num2){
		return num1[0]-num2[0];
	}
}

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