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Submission #716451

# Submission time Handle Problem Language Result Execution time Memory
716451 2023-03-30T06:21:56 Z faribourz Dynamic Diameter (CEOI19_diameter) C++14
24 / 100
 1174 ms 36060 KB 
// Only GOD
// Believe in yourself!
// -o Sango zadam be shishe 
// -o Comeback bezan hamishe!

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;

#define pb push_back
#define F first
#define S second
#define bit(x, y) (x >> y)&1
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define kill(x) return cout << x << '\n', void()
#define KILL(x) return cout << x << '\n', 0
#define mid ((l+r)>>1)
#define lid (id << 1)
#define rid (lid | 1)
const int N = 3e5+10;
const int INF = 1e9+10;
#define int ll
int n, q, W;
vector<pii> G[N];
int edge[N], dp[N], maxout[N], lst, h[N];
pii EDGE[N];
map<pii, int> E;
// chinese seg:)
void upd(int id){
	int mx1 = maxout[lid] + E[{id, lid}], mx2 = maxout[rid] + E[{id, rid}];
	maxout[id] = max(mx1, mx2);
	dp[id] = mx1 + mx2;
	lst = max({lst, dp[id], dp[rid], dp[lid]});
	id >>= 1;
	for(; id > 0; id >>= 1){
		int mx1 = maxout[lid] + E[{id, lid}], mx2 = maxout[rid] + E[{id, rid}];
		maxout[id] = max(mx1, mx2);
		dp[id] = mx1 + mx2;
		lst = max({lst, dp[id], dp[rid], dp[lid]});
	}
}
void DFS(int v, int p = -1){
	int mx1 = -1, mx2 = -1;
	for(auto x : G[v]){
		if(x.F == p)
			continue;
		h[x.F] = h[v] + 1;
		DFS(x.F, v);
		if(edge[x.S] + maxout[x.F] >= mx1){
			swap(mx1, mx2);
			mx1 = edge[x.S] + maxout[x.F]; 
		}
		else if(edge[x.S] + maxout[x.F] > mx2){
			mx2 = edge[x.S] + maxout[x.F]; 
		}
	}
	maxout[v] = (mx1==-1 ? 0 : mx1);
	if(mx2 != -1){
		dp[v] = mx1 + mx2;
	}
}
int32_t main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin >> n >> q >> W;
	for(int i = 0; i < n-1; i++){
		int v, u, w;
		cin >> v >> u >> w;
		G[v].pb({u, i});
		G[u].pb({v, i});
		edge[i] = w;
		EDGE[i]={v, u};
		E[{v, u}]=w;
		E[{u, v}]=w;
	}	
	lst = 0;
	if(n <= 5001 && q <= 5001){
		while(q--){
			int d, e;
			cin >> d >> e;
			edge[(d+lst)%(n-1)] = (e+lst)%W;
			DFS(1);
			lst = 0;
			for(int i = 1; i <= n; i++)
				lst = max({lst, dp[i], maxout[i]});
			cout << lst << '\n';
		}
	}
	else if(sz(G[1]) == n-1){
		set<pii> s;
		for(int i = 0; i < n-1; i++){
			s.insert({edge[i], i});
		}
		while(q--){
			int d, e;
			cin >> d >> e;
			s.erase({edge[(d+lst)%(n-1)], (d+lst)%(n-1)});
			edge[(d+lst)%(n-1)] = (e+lst)%W;
			s.insert({edge[(d+lst)%(n-1)], (d+lst)%(n-1)});
			if(n==2){
				lst = (*s.rbegin()).F;
			}
			else{
				auto itr = s.rbegin();
				lst = (*itr).F;
				itr--;
				lst += (*itr).F;
			}
			cout << lst << '\n';
		}
	}
	else{
		DFS(1);
		while(q--){
			int d, e;
			cin >> d >> e;
			edge[(d+lst)%(n-1)] = (e+lst)%W;
			int v = EDGE[(d+lst)%(n-1)].F, u = EDGE[(d+lst)%(n-1)].S;
			E[{v, u}] = (e+lst)%W;
			E[{u, v}] = E[{v, u}];
			if(u < v)
				swap(v, u);
			lst = 0;
			upd(v);
			cout << lst << '\n';
		}
	}
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 3 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7400 KB Output is correct
5 Correct 5 ms 7332 KB Output is correct
6 Correct 6 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7356 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 6 ms 7380 KB Output is correct
14 Correct 5 ms 7380 KB Output is correct
15 Correct 6 ms 7420 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 3 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7400 KB Output is correct
5 Correct 5 ms 7332 KB Output is correct
6 Correct 6 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7356 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 6 ms 7380 KB Output is correct
14 Correct 5 ms 7380 KB Output is correct
15 Correct 6 ms 7420 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct
19 Correct 96 ms 7612 KB Output is correct
20 Correct 96 ms 7608 KB Output is correct
21 Correct 103 ms 7628 KB Output is correct
22 Correct 122 ms 7644 KB Output is correct
23 Correct 779 ms 8428 KB Output is correct
24 Correct 813 ms 8444 KB Output is correct
25 Correct 858 ms 8532 KB Output is correct
26 Correct 932 ms 8856 KB Output is correct

Subtask #3
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7380 KB Output is correct
2 Correct 5 ms 7380 KB Output is correct
3 Correct 5 ms 7380 KB Output is correct
4 Incorrect 14 ms 7508 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 7640 KB Output is correct
2 Incorrect 19 ms 7636 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 24.0

# Verdict Execution time Memory Grader output
1 Incorrect 1174 ms 36060 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 3 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7400 KB Output is correct
5 Correct 5 ms 7332 KB Output is correct
6 Correct 6 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7356 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 6 ms 7380 KB Output is correct
14 Correct 5 ms 7380 KB Output is correct
15 Correct 6 ms 7420 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct
19 Correct 96 ms 7612 KB Output is correct
20 Correct 96 ms 7608 KB Output is correct
21 Correct 103 ms 7628 KB Output is correct
22 Correct 122 ms 7644 KB Output is correct
23 Correct 779 ms 8428 KB Output is correct
24 Correct 813 ms 8444 KB Output is correct
25 Correct 858 ms 8532 KB Output is correct
26 Correct 932 ms 8856 KB Output is correct
27 Correct 5 ms 7380 KB Output is correct
28 Correct 5 ms 7380 KB Output is correct
29 Correct 5 ms 7380 KB Output is correct
30 Incorrect 14 ms 7508 KB Output isn't correct
31 Halted 0 ms 0 KB -