Submission #1233509

#	Time	Username	Problem	Language	Result	Execution time	Memory
1233509		thelegendary08	Swapping Cities (APIO20_swap)	C++17	7 / 100	90 ms	18892 KiB

swap

#include "swap.h"
#include<bits/stdc++.h>
#define int long long
#define mp make_pair
#define pb push_back
#define f0r(i,n) for(signed i = 0; i<n; i++)
#define FOR(i, k, n) for(signed i = k; i<n; i++)
#define vi vector<int>
#define vpii vector<pair<int,int>>
#define pii pair<int,int>
#define vb vector<bool>
#define mii map<int,int>
#define vvi vector<vector<int>>
#define vout(v) for(auto u : v)cout<<u<<' '; cout<<endl;
#define dout(a) cout<<a<<' '<<#a<<endl;
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<endl;
using namespace std;
struct edge{
	int u, v, w;
};
vector<vpii> adj;
int n,m;
vector<vi>edges;
struct DSU{
	int n; vi par, sz, hasthree, hascyc;
	DSU(int N){
		n = N;
		par.resize(n); sz.resize(n); hasthree.resize(n); hascyc.resize(n);
		f0r(i,n){
			par[i] = i; sz[i] = 1; hasthree[i] = 0; hascyc[i] = 0;
		}
	}
	int find(int x){
		while(x != par[x])x = par[x];
		return x;
	}
	void unite(int a, int b){
		// dout2(a,b);
		a = find(a); b = find(b);
		if(a == b){
			hascyc[a] = 1;				
			return;
		}
		if(sz[a] < sz[b])swap(a,b);
		sz[a] += sz[b];
		par[b] = a;
		hascyc[a] |= hascyc[b];
		hasthree[a] |= hasthree[b];
	}
};
vi dist;
int l2;
void init(signed N, signed M,
          std::vector<signed> U, std::vector<signed> V, std::vector<signed> W) {
    n = N; m = M;
	adj.resize(N); dist.resize(n);
	dist[0] = 4e18;
	f0r(i, M){
		edges.pb({W[i], U[i], V[i]});
		adj[U[i]].pb(mp(V[i], W[i]));
		adj[V[i]].pb(mp(U[i], W[i]));
		dist[V[i]] = W[i];
	}
	sort(edges.begin(), edges.end());
	
	vi d = dist;
	sort(d.begin(), d.end());
	l2 = d[2];
}

signed getMinimumFuelCapacity(signed X, signed Y) {
	if(n <= 3)return -1;
	if(X > Y)swap(X,Y);
	if(X == 0){
		return max(dist[Y], l2);
	}
	else{
		return max({dist[X], dist[Y], l2});
	}
	/*
	vi deg(n);
	DSU d = DSU(n);
	f0r(i, m){
		d.unite(edges[i][1], edges[i][2]);
		deg[edges[i][1]]++;
		deg[edges[i][2]]++;
		int x = d.find(X);
		int y = d.find(Y);
		if(deg[edges[i][1]] == 3){
			d.hasthree[d.find(edges[i][1])] = 1;
		}
		if(deg[edges[i][2]] == 3){
			d.hasthree[d.find(edges[i][2])] = 1;
		}
		if(x == y && (d.hasthree[x] || d.hascyc[x])){
			return edges[i][0];
		}
	}
	return -1;
	*/
}

• Subtask 1: 0 / 6
• Subtask 2: 7 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27