Submission #289681

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
289681	2020-09-02 22:36:18	b00n0rp	Swapping Cities (APIO20_swap)	C++17	100 / 100	651 ms	47608 KiB

swap

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/*
Soln:
Basically we need to find some 3-degree vertex or a cycle
and we want the minimum value of 
-> max(path from (x,y), path from x to the vertex,(3rd shortest edge or cycle edge))
First compute mst then use dp on tree
dp[u] = best such vertex in subtree of u
dp_par[u] = best such vertex outside subtree of u
*/
#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
 
typedef long double LD;
typedef long long ll;
// #define int ll
#define pb push_back
#define mp make_pair
#define REP(i,n) for (int i = 0; i < n; i++)
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define REPD(i,n) for (int i = n-1; i >= 0; i--)
#define FORD(i,a,b) for (int i = a; i >= b; i--)
#define remax(a,b) a = max(a,b)
#define remin(a,b) a = min(a,b)
#define all(v) v.begin(),v.end()
typedef map<int,int> mii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> pii;
typedef vector<pii> vpii;
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 17 / 17
• Subtask 4: 20 / 20
• Subtask 5: 23 / 23
• Subtask 6: 27 / 27