Submission #346897

#	Time	Username	Problem	Language	Result	Execution time	Memory
346897		knightron0	Birthday gift (IZhO18_treearray)	C++14	0 / 100	46 ms	92012 KiB

treearray

#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define clr(a) memset(a, 0, sizeof(a))
#define sz(x) x.size()
#define printvector(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout<<*it<<" "; cout<<endl;
#define REP(i, n) for (int i = 0; i < n; i++)
#define FOR(i, x, y) for (int i = x; i < y; i++)
#define DEC(i, x, y) for (int i = x; i >= y; i--)
#define all(v) v.begin(), v.end()
#define min3(a, b, c) min(a, min(b, c))
#define max3(a, b, c) max(a, max(b, c))
#define alla(a, n) a, a + n
#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) (a * b)/gcd(a, b)
#define int long long int
#define ull unsigned long long
#define printarray(arr, n) for(int i= 0;i<n;i++) cout<<arr[i]<<' '; cout<<endl;
#define printvecpairs(vec) for(auto it: vec) cout<<it.fr<<' '<<it.sc<<endl;
#define initdp(a) memset(a, -1, sizeof(a));
#define endl '\n'
#define float long double

using namespace std;
const int MOD = 1e9 + 7;
const int INF = 2e15;
const int MAXN = 1e5 + 5;

int fastexpo(int b, int exp){
    if(exp == 0) return 1;
    if(exp == 1) return b;
    int ans = (fastexpo(b,exp/2) % MOD);
    ans *= ans;
    ans %= MOD;
    if(exp % 2 == 1){
        ans *= b;
    }
    ans %= MOD;
    return ans;
}

set<int> prlca[MAXN];
set<int> sngle[MAXN];
vector<int> adj[MAXN];
int up[MAXN][100];
int timer = 0;
int tout[MAXN], tin[MAXN];
int n;
int l;
int a[MAXN];

void dfs(int v, int p){
	timer++;
	tin[v] = timer;
	up[v][0] = p;
	for(int i=1;i<=l;i++){
		up[v][i] = up[up[v][i-1]][i-1];
	}
	for(int u: adj[v]){
		if(u != p){
			dfs(u, v);
		}
	}
	timer++;
	tout[v] = timer;
}

bool isanc(int a, int b){
	return tin[a] <= tin[b] && tout[a] >= tout[b];
}

void preprocess(){
	timer = 0;
	clr(tout);
	clr(tin);
	l = ceil(log2(n));	
	clr(up);
}

int lca(int u, int v){
	if(isanc(u, v)){
		return u;
	}
	if(isanc(v, u)){
		return v;
	}
	for (int i = l; i >= 0; i--) {
        if (!isanc(up[u][i], v))
            u = up[u][i];
    }
    return up[u][0];
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
   	int m, q;
   	cin>>n>>m>>q; 
   	for(int i= 0;i<n-1;i++){
   		int t1, t2;
   		cin>>t1>>t2;
   		adj[t1].pb(t2);
   		adj[t2].pb(t1);
   	}
   	for(int i= 1;i<=m;i++){
   		cin>>a[i];
   	}
   	preprocess();
   	dfs(1, 1);
   	int mem[m+1];
   	for(int i=1;i<m;i++){
   		int lc = lca(a[i],a[i+1]);
   		mem[i] = lc;
   		prlca[lc].insert(i);
   		sngle[a[i]].insert(i);
   	}
   	sngle[a[m]].insert(m);
   	while(q--){
   		int t1;
   		cin>>t1;
   		if(t1==2){
   			int x, y, req;
   			cin>>x>>y>>req;
   			auto it = prlca[req].lower_bound(x);
   			int mn = -1;
   			if(it != prlca[req].end()){
   				mn = *it;
   			}
   			auto it2 = sngle[req].lower_bound(x);
   			int mn2 = -1;
   			if(it2 != sngle[req].end()){
   				mn2 = *it2;
   			}
   			if((mn >= x && mn <= y && mn+1 <= m && mn >= 1) || (mn2 >= x && mn2 <= y && mn2 <= m && mn2 >= 1)){
   				if(mn2 >= x && mn2 <= y && mn2 <= m && mn2 >= 1){
   					cout<<mn2<<' '<<mn2<<endl;
   					continue;
   				} else {
   					if(mn >= x && mn+1 <= y && mn+1 <= m && mn >= 1){
   						cout<<mn<<' '<<mn+1<<endl;
   						continue;
   					}
   				}
   			}
			cout<<"-1 -1"<<endl;
   		}else {
   			int x, y;
   			cin>>x>>y;
   			sngle[a[x]].erase(sngle[a[x]].find(x));
   			sngle[y].insert(x);
   			// x-1, x
   			if(x > 1) {
   				int prev = mem[x-1];
   				int newlca = lca(a[x-1], y);
   				if(prev != newlca){
   					prlca[prev].erase(prlca[prev].erase(x-1));
   					prlca[newlca].insert(x-1);
   				}
   			}
   			// x, x+1
   			if(x < m){
				int prev = mem[x];
   				int newlca = lca(a[x+1], y);
   				if(prev != newlca){
   					prlca[prev].erase(prlca[prev].erase(x));
   					prlca[newlca].insert(x);
   				}
   			}
   			a[x]= y;
   		}
   	}
   	return 0;
}

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