http://poj.org/problem?id=2459 //* @author: ccQ.SuperSupper import java.io.*; import java.util.*; public class Main { static final int N = 2000+10; static int DP[] = new int[N]; public static void main(String[]args) throws Exception{ int n,F1,F2,Day,i,sum,a,b,j; //Scanner cin = new Scanner(new FileInputStream("input.txt")); Scanner cin = new Scanner(System.in); n = cin.nextInt(); F1 = cin.nextInt(); F2 = cin.nextInt(); Day = cin.nextInt(); for(i=0;i< N;++i) DP[i] = 0; for(i=0;i< n;++i){ a = cin.nextInt(); b = cin.nextInt(); for(j=a;j<=b;++j) ++DP[j]; } sum = 0; for(i=Day;i>=0;--i){ sum+=DP[i]; if(sum==F1-F2){ System.out.println(i); break; } } } }
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