Submission #941951

#	Time	Username	Problem	Language	Result	Execution time	Memory
941951		Lalic	Roller Coaster Railroad (IOI16_railroad)	C++17	Compilation error	0 ms	0 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define allr(x) x.rbegin(), x.rend()
#define mp make_pair

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e5+10;
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;
const int MOD = 1e9+7;

long long solve(vector<int> s, vector<int> t){
	int n=(int)s.size();
    
	for(int i=0;i<n;i++)
		for(int j=0;j<(1<<n);j++)
			dp[i][j]=LINF;
	
	dp[0][0]=0;
	for(int i=1;i<(1<<n);i++){
		for(int j=0;j<n;j++){
			if(!(i&(1<<j))) continue;
			int curr=(i^(1<<j));
			if(curr==0) dp[j][i]=0;
			else{
				for(int k=0;k<n;k++){
					if(!(curr&(1<<k))) continue;
					dp[j][i]=min(dp[j][i], dp[k][curr]+max((ll)t[k]-(ll)s[j], 0ll));
				}
			}
		}
	}
	
	ll ans=LINF;
	for(int i=0;i<n;i++) ans=min(ans, dp[i][(1<<n)-1]);
	
	return ans;
}

long long plan_roller_coaster(vector<int> s, vector<int> t) {
	if((int)s.size()<=16) return solve(s, t);
	
    vector<int> arr;
    for(auto u : s) arr.pb(u);
    for(auto u : t) arr.pb(u);
    sort(all(arr));
    arr.erase(unique(all(arr)), arr.end());
    
    int n=(int)arr.size();
    
    map<int, int> mp;
    vector<int> g(n, 0);
    for(int i=0;i<n;i++) mp[arr[i]]=i;
    
    vector<vector<int>> adj(n);
    adj[n-1].pb(0);
    g[n-1]++; g[0]--;
    
    for(int i=0;i<(int)s.size();i++){
		g[mp[s[i]]]++; g[mp[t[i]]]--;
		adj[mp[s[i]]].pb(mp[t[i]]);
	}
	
	for(int i=0;i<n-1;i++){
		if(g[i]>0) return 1;
		if(g[i]<0) adj[i].pb(i+1), g[i+1]+=g[i], g[i]=0;
	}
	
	if(g[n-1]!=0) return 1;
	
	vector<int> cmp(n, 0);
	cmp[0]=1;
	queue<int> q; q.push(0);
	while(!q.empty()){
		int curr=q.front();
		q.pop();
		
		for(auto u : adj[curr]){
			if(!cmp[u]){
				cmp[u]=1;
				q.push(u);
			}
		}
	}
	
	for(int i=0;i<n;i++)
		if(!cmp[i]) return 1;
	return 0;
}

Compilation message (stderr)

railroad.cpp: In function 'long long int solve(std::vector<int>, std::vector<int>)':
railroad.cpp:26:4: error: 'dp' was not declared in this scope; did you mean 'mp'?
   26 |    dp[i][j]=LINF;
      |    ^~
      |    mp
railroad.cpp:28:2: error: 'dp' was not declared in this scope; did you mean 'mp'?
   28 |  dp[0][0]=0;
      |  ^~
      |  mp