Submission #943981

#	Time	Username	Problem	Language	Result	Execution time	Memory
943981		vjudge1	Dynamic Diameter (CEOI19_diameter)	C++17	0 / 100	192 ms	18456 KiB

diameter

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pii pair<int,int>
using namespace __gnu_pbds;
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define f first
#define int long long
#define s second
#define pii pair<int,int>
template<class T>bool umax(T &a,T b){if(a<b){a=b;return true;}return false;}
template<class T>bool umin(T &a,T b){if(b<a){a=b;return true;}return false;}
typedef tree<int, null_type, less_equal<int>, rb_tree_tag,
	tree_order_statistics_node_update> ordered_set;
const int N=3e5 + 5	;
const int inf = 1e17 + 7;
const int mod = 998244353;

int n,m,k;
vector<pii>g[N];

pii t[N*4];

void update(int tl, int tr, int v, int pos, int val){
	
	if(tl == tr){
		t[v] = {val,-1};
		return;
	}
	int tm = (tl + tr)/2;
	
	if(pos<=tm)
		update(tl,tm,v*2,pos,val);
	else 
		update(tm+1,tr,v*2+1,pos,val);
	
	vector<int>a = {t[v*2].f, t[v*2].s, t[v*2+1].f, t[v*2+1].s};
	sort(rall(a));
	
	t[v] = {a[0],a[1]};
}

void solve(){
	
	cin >> n >> m >> k;
	
	
	for(int i = 0;i<n - 1;i++){
		int a,b,c;
		cin >> a >> b >> c;
		
		g[a].pb({b,c});
		g[b].pb({a,c});
		update(0,n-2,1,i,c);
	}
	
	int last = 0;
	
	while(m--){
		int a,b;
		
		cin >> a >> b;
		
		int pos = (a + last) % (n - 1);
		int val = (b + last) % k;
		
		update(0,n-2,1,pos,val);
		cout<<t[1].f + t[1].s<<"\n";
		
		last = t[1].f + t[1].s;
	}
	
	
	
}

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

}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 13
• Subtask 3: 0 / 7
• Subtask 4: 0 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 27