Submission #1126773

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126773		KasymK	Cop and Robber (BOI14_coprobber)	C++20	0 / 100	258 ms	327680 KiB

coprobber

#include "bits/stdc++.h"
#include "coprobber.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 505;
const int B = 10;
const int INF = 1e9;
vector<int> adj[N];
int d[N], now, dis[N][N], sp[N][B];

void dfs(int x=0, int pr=-1){
	tr(it, adj[x])
	if(*it!=pr){
		d[*it]=d[x]+1;
		sp[x][0]=pr;
		dfs(*it, x);
	}
}

int get(int x, int k){
	for(int i = 0; i < B; ++i)
		if(k>>i&1)
			x=sp[x][i];
	return x;
}

int lca(int a, int b){
	if(d[a]<d[b])
		swap(a, b);
	int ad = d[a]-d[b];
	a = get(a, ad);
	if(a==b)
		return a;
	for(int i = B; i >= 0; --i)
		if(sp[a][i]!=sp[b][i])
			a=sp[a][i], b=sp[b][i];
	return sp[a][0];
}

int calc(int i, int j){
	return d[i]+d[j]-2*d[lca(i, j)];
}

int start(int n, bool v[MAX_N][MAX_N]){
	for(int i = 0; i < n; ++i)
		for(int j = 0; j < n; ++j)
			if(v[i][j])
				adj[i].pb(j);
	dfs();
	for(int i = 0; i < n; ++i)
		for(int j = 1; j < B; ++j)
			sp[i][j] = sp[sp[i][j-1]][j-1];
	for(int i = 0; i < n; ++i)
		for(int j = 0; j < n; ++j)
			dis[i][j] = calc(i, j);
	now = 0;
	return now;
}

int nextMove(int r){
	int mn = INF;
	tr(it, adj[now])
	if(umin(mn, dis[r][*it]))
		now=*it;
	return now;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 14
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40