제출 #865679

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
865679		vjudge1	Birthday gift (IZhO18_treearray)	C++17	0 / 100	3 ms	14940 KiB

treearray

#include <bits/stdc++.h>
 
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define optimus_prime ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define fxd(x) fixed << setprecision(x)
#define all(a) (a.begin() , a.end())
#define popcount(x) __builtin_popcount(x)
#define lwb lower_bound
#define upb upper_bound
#define dl double long
#define ll long long
#define pb push_back
#define sz() size()
#define F first
#define S second
 
using namespace std;
 
const ll N = 1e5+9;
const ll L = 30;

ll n , m , q , a[N] , tin[N] , tout[N] , timer , h[N] , up[N][L];
vector <int> g[N];
set <int> st[N] , st1[N];

void calc(ll cur , ll p , ll len=1){
	h[cur]=len;
	tin[cur]=++timer;
	up[cur][0]=p;
	for (int i = 1 ; i <= L ; i++)up[cur][i]=up[up[cur][i-1]][i-1];
	for (auto to : g[cur]){
		if (to!=p)calc(to , cur , len+1);
	}
	tout[cur]=timer;
}

bool upper(ll a , ll b){
	if (tin[a]<=tin[b]&&tout[b]<=tout[a])return 1;
	return 0;
}

ll lca(ll a , ll b){
	if (upper(a , b))return a;
	if (upper(b , a))return b;
	for (int i = L ; i >= 0 ; i--){
		if (!upper(up[a][i] , b))a=up[a][i];
	}
	return up[a][0];
}

void solve(){
	cin >> n >> m >> q;
	for (int i = 1 ; i < n ; i++){
		ll u , v;
		cin >> u >> v;
		g[u].pb(v);
		g[v].pb(u);
	}
	calc(1 , 1);
	for (int i = 1 ; i <= m ; i++){
		cin >> a[i];
		st[a[i]].insert(i);
		if (i>1)st1[lca(a[i-1] , a[i])].insert(i-1);
	}
	while (q--){
		ll tp;
		cin >> tp;
		if (tp==1){
			ll pos , v;
			cin >> pos >> v;
			if (pos<m)st1[lca(a[pos] , a[pos+1])].erase(pos);
			if (pos>1)st1[lca(a[pos-1] , a[pos])].erase(pos-1);
			st[a[pos]].erase(pos);
			a[pos]=v;
			st[a[pos]].insert(pos);
			if (pos<m)st1[lca(a[pos] , a[pos+1])].insert(pos);
			if (pos>1)st1[lca(a[pos-1] , a[pos])].insert(pos-1);
		}
		else {
			ll l , r , v;
			cin >> l >> r >> v;
			if (st[v].lwb(l)!=st[v].end() && (*st[v].lwb(l))<=r){
				ll x=*(st[v].lwb(l));
				cout << x << " " << x << "\n";
			}
			else if (st1[v].lwb(l)!=st1[v].end() && (*st1[v].lwb(l))<r){
				ll x=*(st1[v].lwb(l));
				cout << x << " " << x+1 << "\n";
			}
			else cout << "-1 -1\n";
			
		}
	}
}
	
signed main() {
	optimus_prime;
	solve();
return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

treearray.cpp: In function 'void calc(long long int, long long int, long long int)':
treearray.cpp:30:42: warning: iteration 29 invokes undefined behavior [-Waggressive-loop-optimizations]
   30 |  for (int i = 1 ; i <= L ; i++)up[cur][i]=up[up[cur][i-1]][i-1];
      |                                ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
treearray.cpp:30:21: note: within this loop
   30 |  for (int i = 1 ; i <= L ; i++)up[cur][i]=up[up[cur][i-1]][i-1];
      |                   ~~^~~~

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