Submission #488776

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
488776	2021-11-20T12:16:25 Z	cfalas	Dynamic Diameter (CEOI19_diameter)	C++14	7 / 100	549 ms	21364 KB

diameter

#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, ll> iii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)

int t, n;
vi a, b;

vector<vii> adj;

ii f;

void dfs(int s, int p=-1, ll d=0){
	if(d>f.F) f = max(f, {d, s});
	FOA(v, adj[s]){
		if(v.F!=p) dfs(v.F, s, d+v.S);
	}
}

int main(){
	int q;
	ll w;
	cin>>n>>q>>w;
	adj.assign(n+1, vii());

	vector<pair<ii,ii> > edg(n-1);
	set<ii> ws;
	vi wu(n);
	FOR(i,n-1){
		ll a, b, c;
		cin>>a>>b>>c;
		ws.insert({-c, i});
		wu[i] = c;
		edg[i] = {{a, adj[a].size()}, {b, adj[b].size()}};
		adj[a].push_back({b,c});
		adj[b].push_back({a,c});
	}
	ll last=0;
	while(q--){
		ll a, b;
		cin>>a>>b;
		a= (a + last) % (n-1);
		b = (b+last) % w;

		adj[edg[a].F.F][edg[a].F.S].S = b;
		adj[edg[a].S.F][edg[a].S.S].S = b;

		f = {0,1};
		//dfs(1);
		//dfs(f.S);

		ws.erase({-wu[a], a});
		ws.insert({-b, a});
		wu[a] = b;


		//last = f.F;
		if(n==2) last = -(*ws.begin()).F;
		else last = -(*ws.begin()).F - (*(++ws.begin())).F;
		cout<<last<<endl;

	}
}

Subtask #1
0 / 11.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	204 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #2
0 / 13.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	204 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #3
7.0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	4 ms	204 KB	Output is correct
4	Correct	35 ms	320 KB	Output is correct
5	Correct	182 ms	704 KB	Output is correct
6	Correct	0 ms	204 KB	Output is correct
7	Correct	1 ms	332 KB	Output is correct
8	Correct	1 ms	332 KB	Output is correct
9	Correct	4 ms	388 KB	Output is correct
10	Correct	38 ms	424 KB	Output is correct
11	Correct	191 ms	712 KB	Output is correct
12	Correct	5 ms	1100 KB	Output is correct
13	Correct	5 ms	1100 KB	Output is correct
14	Correct	9 ms	1100 KB	Output is correct
15	Correct	46 ms	1188 KB	Output is correct
16	Correct	206 ms	1644 KB	Output is correct
17	Correct	109 ms	17444 KB	Output is correct
18	Correct	111 ms	17460 KB	Output is correct
19	Correct	119 ms	17500 KB	Output is correct
20	Correct	162 ms	17584 KB	Output is correct
21	Correct	420 ms	20376 KB	Output is correct