Submission #400787

#	Time	Username	Problem	Language	Result	Execution time	Memory
400787		kshitij_sodani	Shortcut (IOI16_shortcut)	C++14	31 / 100	2086 ms	35784 KiB

shortcut

#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
//#define endl '\n'

#include "shortcut.h"
//vector<pair<llo,llo>> adj[1000001];
llo dist[6001][6001];
vector<pair<llo,llo>> adj[1000001];
void dfs(llo no,llo par=-1,llo no2=-1,llo lev=0){
	dist[no2][no]=lev;
	for(auto j:adj[no]){
		if(j.a!=par){
			dfs(j.a,no,no2,lev+j.b);
		}
	}
}
long long find_shortcut(int n, std::vector<int> aa, std::vector<int> bb, int cc)
{
	for(int i=0;i<n-1;i++){
		adj[i].pb({i+1,aa[i]});
		adj[i+1].pb({i,aa[i]});
	}
	for(int i=0;i<n;i++){
		adj[i].pb({n+i,bb[i]});
		adj[n+i].pb({i,bb[i]});
	}
	for(int i=0;i<2*n;i++){
		dfs(i,-1,i);
	}
	/*for(int i=0;i<2*n;i++){
		for(int j=0;j<2*n;j++){
			cout<<dist[i][j]<<",";
		}
		cout<<endl;
	}*/
	llo ans=1e18;
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			llo ma=0;
			for(int k=n;k<2*n;k++){
				for(int l=k;l<2*n;l++){
					ma=max(ma,min(dist[k][l],min(dist[k][i]+cc+dist[j][l],dist[k][j]+cc+dist[i][l])));		
					
				}
			}
			/*if(ma==0){
				cout<<i<<":"<<j<<endl;
			}*/
			ans=min(ans,ma);
		}
	}




    return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 14 / 14
• Subtask 3: 8 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3