Submission #160743

#	Time	Username	Problem	Language	Result	Execution time	Memory
160743		shashwatchandra	Birthday gift (IZhO18_treearray)	C++17	56 / 100	4011 ms	52344 KiB

treearray

/*input
5 4 4
1 2
3 1
3 4
5 3
4 5 2 3
2 1 3 1
1 3 5
2 1 3 1
2 3 4 5

*/
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#define int long long 
#define double long double
#define f first
#define s second
#define mp make_pair
#define pb push_back

#define RE(i,n) for (int i = 1; i <= n; i++)
#define RED(i,n) for (int i = n; i > 0; i--)
#define REPS(i,n) for(int i = 1; (i*i) <= n; i++)
#define REP(i,n) for (int i = 0; i < (int)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 all(v) v.begin(),v.end()
#define pii pair<int,int>
#define vi vector<int>
#define vvi vector<vi>
#define print(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout << *it << " "; cout << endl;
#define debug(x) cout << x << endl;
#define debug2(x,y) cout << x << " " << y << endl;
#define debug3(x,y,z) cout << x << " " << y << " " << z << endl;

typedef tree<
int,
null_type,
less<int>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;

const int INF = 1e18+1;
const int MOD = 1e9+7;
const double PI = 3.14159265358979323846264338;

int raise(int a,int n,int m = MOD){
  if(n == 0)return 1;
  if(n == 1)return a;
  int x = 1;
    x *= raise(a,n/2,m);
    x %= m;
    x *= x;
    x %= m;
    if(n%2)x*= a;
    x %= m;
    return x;
}

int floor1(int n,int k){
    if(n%k == 0 || n >= 0)return n/k;
    return (n/k)-1;
}

int ceil1(int n,int k){
    return floor1(n+k-1,k);
}

const int LG = 18;
const int N = 2e5+1;
vector<int> adj[N];
int n,m,q;
int pre[N][LG];
int a[N];
int dist[N];

void dfs(int u,int p){
	pre[u][0] = p;
	RE(i,LG-1){
		pre[u][i] = pre[pre[u][i-1]][i-1];
	}
	for(int v:adj[u]){
		if(v == p)continue;
		dist[v] = dist[u]+1;
		dfs(v,u);
	}
}

int lca(int u,int v){
	if(dist[v] > dist[u])swap(u,v);
	for(int i = LG-1;i > -1;i--){
		if(dist[pre[u][i]] >= dist[v]){
			u = pre[u][i];
		}
	}
	for(int i = LG-1;i > -1;i--){
		if(pre[u][i] != pre[v][i]){
			u = pre[u][i];
			v = pre[v][i];
		}
	}
	if(u == v)return u;
	return pre[u][0];
}

void solve(){
  	cin >> n >> m >> q;
  	RE(i,n-1){
  		int a,b;cin >> a >> b;
  		adj[a].pb(b);
  		adj[b].pb(a);
  	}
  	dist[1] = 1;
  	dfs(1,0);
  	RE(i,m)cin >> a[i];
  	while(q--){
  		int ty;cin >> ty;
  		if(ty == 1){
  			int ind,ok;cin >> ind >> ok;
  			a[ind] = ok;
  		}
  		else{
  			int k;
  			int l,r;cin >> l >> r >> k;
  			bool f = 0;
  			for(int i = l;i <= r;i++){
  				if(a[i] == k){
  					cout << i << " " << i << endl;
  					f = 1;
  					break;
  				}
  				if(i < r and lca(a[i],a[i+1]) == k){
  					cout << i << " " << i+1 << endl;
  					f = 1;
  					break;
  				}
  			}
  			if(!f)cout << "-1 -1\n";
  		}
  	}
}


signed main(){
  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  //freopen(".in","r",stdin);freopen(".out","w",stdout);
  int t = 1;
  //cin >> t;
  while(t--){
    solve();
  }
  return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 26 / 26
• Subtask 4: 0 / 44