http://poj.org/problem?id=2437 //* @author: ccQ.SuperSupper import java.io.*; import java.util.*; class POOL implements Comparable{ int left,right; public int compareTo(Object oo){ POOL temp = (POOL) oo; if(temp.left< this.left) return 1; return -1; } } public class Main { static final int N = 10000+100; static int n,L; static POOL pool[] = new POOL[N]; static void start(){ for(int i=0;i< N;++i) pool[i] = new POOL(); } public static void main(String[]args) throws Exception{ int i; start(); StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in))); n = Get_Num(cin); L = Get_Num(cin); for(i=0;i< n;++i){ pool[i].left = Get_Num(cin); pool[i].right = Get_Num(cin); } Arrays.sort(pool,0,n); System.out.println(solve()); } static int solve(){ int ans=0,cnt=0,i=0,j; while(i< n){ if(pool[i].right>cnt-1){ j = (Min(pool[i].right-pool[i].left,pool[i].right-cnt)+L-1)/L; cnt = Max(pool[i].left,cnt)+j*L; ans+=j; } ++i; } return ans; } static int Max(int a,int b){ return a>b?a:b; } static int Min(int a,int b){ return a< b?a:b; } static int Get_Num(StreamTokenizer cin) throws Exception{ cin.nextToken(); return (int) cin.nval; } }
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