Submission #617002

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Source Code Expand

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define all(c) c.begin(),c.end()
#define pb push_back
#define fs first
#define sc second
#define show(x) cout << #x << " = " << x << endl
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
using namespace std;
typedef long long ll;
int N,L,t[100000],x[100000];
ll dp[2001][2001];
ll inf=1e18;
int main(){
	cin>>N>>L;
	rep(i,N) cin>>t[i]>>x[i];
	rep(i,2001) rep(j,2001) dp[i][j]=inf;
	dp[0][0]=0;
	rep(i,N){
		if(i>0&&t[i-1]==t[i]){
			rep(j,L+1){
				chmin(dp[i+1][j],dp[i][j]+abs(x[i]-j));
			}
		}else{
			ll mn=dp[i][0];
			rep(j,L+1){
				chmin(mn,dp[i][j]);
				chmin(dp[i+1][j],mn+abs(x[i]-j));
			}
		}
	}
	ll ans=inf;
	rep(i,L+1) chmin(ans,dp[N][i]);
	cout<<ans<<endl;
}

Submission Info

Judge Result