Submission #1225508

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225508		_rain_	Long Distance Coach (JOI17_coach)	C++20	71 / 100	2095 ms	8228 KiB

coach

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

const int N=(int)2e5;
const LL INF=(LL)1e18;
	LL s[N+2];
	pair<LL,int>d[N+2];
	int n,m;
	LL w,x,t;

namespace subtask1{
	bool check(){
		return n<=1000 && m<=1000;
	}
	
	LL pre[N+2]={};
	int need[N+2]={};
	LL dp[N+2]={};
	
	void main_code(){
		
		sort(d+1,d+m+1,[&](pair<LL,int> x,pair<LL,int> y){
			return x.first % t < y.first % t;
		});
		s[++n]=x;
		sort(s+1,s+n+1);
		for(int i=1;i<=m;++i) pre[i]=pre[i-1]+d[i].second;
		for(int i=1;i<=n;++i) {
			int pos=upper_bound(d+1,d+m+1,pair<LL,int>(s[i]%t,-1))-d-1;
			if (need[pos]==0) need[pos]=i;
		}
		dp[0]=(LL)(x/t)*w+w;
		for(int i=1;i<=m;++i){
			dp[i]=dp[i-1]+(LL)(x/t+(x%t>=d[i].first))*w;
			if (need[i]){
				for(int j=0;j<i;++j){
					dp[i]=min(dp[i],dp[j]+pre[i]-pre[j]+(LL)(s[need[i]]/t)*(i-j)*w);
				}
			}
		}
		cout<<dp[m]<<'\n';
	}
		      
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0) ; cout.tie(0);
	#define task "main"
	if (fopen(task".inp","r")){
		freopen(task".inp","r",stdin);
		freopen(task".out","w",stdout);
	}
	cin>>x>>n>>m>>w>>t;
	for(int i=1;i<=n;++i) cin>>s[i];
	for(int i=1;i<=m;++i) cin>>d[i].first>>d[i].second;
	return subtask1::main_code(),0;
	return 0;
}

Compilation message (stderr)

coach.cpp: In function 'int main()':
coach.cpp:52:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |                 freopen(task".inp","r",stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
coach.cpp:53:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |                 freopen(task".out","w",stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 29