Submission #430807

#	Time	Username	Problem	Language	Result	Execution time	Memory
430807		Belgutei	Wiring (IOI17_wiring)	C++17	100 / 100	53 ms	8132 KiB

wiring

#include "wiring.h"
#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define ff first
#define ss second
#define pb push_back
#define mk make_pair

pair<ll,ll> a[200005];
ll sum[200005],cnt;
ll dp[200005];

long long min_total_length(std::vector<int> red, std::vector<int> blue) {
	for(int i=0; i<red.size(); i++){
		cnt++;
		a[cnt].ff=red[i];
		a[cnt].ss=0;
	}
	for(int i=0; i<blue.size(); i++){
		cnt++;
		a[cnt].ff=blue[i];
		a[cnt].ss=1;
	}
	sort(a+1,a+cnt+1);
	for(int i=1; i<=cnt; i++){
		sum[i]=sum[i-1]+a[i].ff;	
	}
	a[0].ff=-1e9;
	a[0].ss=1-a[1].ss;
	for(int i=1, p=1; i<=cnt; i++){
		int j=i;
		while(j<cnt && a[j+1].ss==a[i].ss) j++;
		for(int k=p; k<i; k++){
			dp[k]=min(dp[k],dp[k-1]+a[i].ff-a[k].ff);
		}
		ll C=0,M=dp[i-1];
		for(int k=i; k<=j; k++){
			C+=a[k].ff-a[i-1].ff;
			int x=2*i-k-2;
			if(x+1>=p){
				M=min(M,dp[x]+a[i-1].ff*(i-x-1)-(sum[i-1]-sum[x]));
			}
			dp[k]=M+C;
		}
		p=i;
		i=j;
	}
	return dp[cnt];
}

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:17:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for(int i=0; i<red.size(); i++){
      |               ~^~~~~~~~~~~
wiring.cpp:22:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for(int i=0; i<blue.size(); i++){
      |               ~^~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 13 / 13
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 45 / 45