Submission #428180

#	Time	Username	Problem	Language	Result	Execution time	Memory
428180		jeqcho	Simurgh (IOI17_simurgh)	C++17	13 / 100	3071 ms	332 KiB

simurgh

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

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pii> vpi;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define F0R(i,b) FOR(i,0,b)
#define ROF(i,a,b) for(int i=(b)-1;i>=(a);--i)
#define R0F(i,b) ROF(i,0,b)
#define all(x) begin(x),end(x)
#define pb push_back
#define trav(a,x) for(auto&a:x)
#define sz(x) int(x.size())

vi u;
vi v;
int n,m;
bool done=0;
vi ans;
int const N=7+3;
vi adj[N];
bool vis[N];

void dfs(int now,int par)
{
	if(vis[now])return;
	vis[now]=1;
	trav(chi,adj[now])
	{
		if(chi==par)continue;
		dfs(chi,now);
	}
}
vi cur;

bool valid()
{
	F0R(i,n)adj[i].clear();
	fill(vis,vis+n,0);
	F0R(i,n-1)
	{
		adj[u[cur[i]]].pb(v[cur[i]]);
		adj[v[cur[i]]].pb(u[cur[i]]);
	}
	dfs(0,-1);
	F0R(i,n)
	{
		if(!vis[i])return 0;
	}
	return 1;
}

void recur(int now)
{
	if(sz(cur)>=n)return;
	if(done)return;
	if(now==m)
	{
		if(sz(cur)!=n-1)return;
		if(!valid())return;
		int res = count_common_roads(cur);
		if(res==n-1)
		{
			ans=cur;
			done=1;
		}
		return;
	}
	recur(now+1);
	cur.pb(now);
	recur(now+1);
	cur.pop_back();
}

vi find_roads(int n1, vi u1, vi v1) {
	n=n1;
	m=sz(u1);
	u=u1;
	v=v1;
	recur(0);
	assert(done);
	return ans;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30