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Submission #290026

# Submission time Handle Problem Language Result Execution time Memory
290026 2020-09-03T09:58:19 Z ngotienhung Dynamic Diameter (CEOI19_diameter) C++14
100 / 100
 688 ms 48756 KB 
#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define pb push_back

using namespace std;

const int maxN = 2e5 + 10;
const int inf = 2e18 + 10;

struct TEdge{int u, v, w;};

int         n,q,w,v;
int         timer = 0;
int         vtx[maxN], tin[maxN], tout[maxN], a[maxN], d[maxN];
TEdge       e[maxN];
vector<int> adj[maxN];

struct Node
{
    int d1, d2, d12, d23, d123, tmp;

    void add(int t){
        d1 += t;
        d2 += t;
        d12 -= t;
        d23 -= t;
        tmp += t;
    }

    void push(Node& a, Node& b){
        a.add(tmp);
        b.add(tmp);
    }
} st[maxN * 4];

Node operator + (Node a, Node b){
    Node x;
    x.d1 = max(a.d1, b.d1);
    x.d2 = min(a.d2, b.d2);
    x.d12 = max(a.d12, max(b.d12, a.d1 - b.d2 * 2));
    x.d23 = max({a.d23, b.d23, -2 * a.d2 + b.d1});
    x.d123 = max(max(a.d123, b.d123), max(a.d12 + b.d1, a.d1 + b.d23));
    x.tmp = 0;
    return x;
}

void dfs(int u){
    tin[u] = timer;

    for(auto x : adj[u]){
        if(vtx[x] != u){
            if(e[x].u == u)
                v = e[x].v;
            else
                v = e[x].u;
            vtx[x] = v;
            d[v] = d[u] + e[x].w;
            a[timer++] = d[u];
            dfs(v);
        }
    }
    a[timer++] = d[u];
    tout[u] = timer;
}

void build(int id, int l, int r){
    if(l + 1 == r){
        st[id] = {a[l], a[l], -inf, -inf, 0, 0};
    }
    else{
        build(id << 1, l, (l + r) >> 1);
        build(id << 1 | 1, (l + r) >> 1, r);
        st[id] = st[id << 1] + st[id << 1 | 1];
    }
}

void update(int id, int l, int r, int u, int v, int d){
    if(u <= l && r <= v){
        st[id].add(d);
        return;
    }

    if(r <= u || l >= v) return;

    st[id].push(st[id << 1], st[id << 1 | 1]);
    int mid = (l + r) >> 1;
    update(id << 1, l, mid, u, v, d);
    update(id << 1 | 1, mid, r, u, v, d);
    st[id] = st[id << 1] + st[id << 1 | 1];
}

int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(); cout.tie();
    //freopen("DD.inp", "r", stdin);

    cin >> n >> q >> w;
    for(int i = 0; i < n - 1; ++i){
        cin >> e[i].u >> e[i].v >> e[i].w;
        adj[e[i].u].pb(i);
        adj[e[i].v].pb(i);
    }

    dfs(1);
    build(1, 0, 2 * n - 1);

    int last = 0;
    for(int i = 1; i <= q; ++i){
        int x,y;
        cin >> x >> y;
        x = (x + last) % (n - 1);
        y = (y + last) % w;
        int u = vtx[x];
        update(1, 0, 2 * n - 1, tin[u], tout[u], y - e[x].w);
        e[x].w = y;
        last = max(st[1].d1, st[1].d123);
        cout << last << endl;
    }
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5120 KB Output is correct
2 Correct 4 ms 5120 KB Output is correct
3 Correct 4 ms 5120 KB Output is correct
4 Correct 4 ms 5120 KB Output is correct
5 Correct 4 ms 5120 KB Output is correct
6 Correct 4 ms 5120 KB Output is correct
7 Correct 4 ms 5120 KB Output is correct
8 Correct 4 ms 5120 KB Output is correct
9 Correct 4 ms 5120 KB Output is correct
10 Correct 4 ms 5120 KB Output is correct
11 Correct 4 ms 5120 KB Output is correct
12 Correct 4 ms 5120 KB Output is correct
13 Correct 4 ms 5120 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 4 ms 5120 KB Output is correct
16 Correct 4 ms 5120 KB Output is correct
17 Correct 4 ms 5120 KB Output is correct
18 Correct 4 ms 5120 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5120 KB Output is correct
2 Correct 4 ms 5120 KB Output is correct
3 Correct 4 ms 5120 KB Output is correct
4 Correct 4 ms 5120 KB Output is correct
5 Correct 4 ms 5120 KB Output is correct
6 Correct 4 ms 5120 KB Output is correct
7 Correct 4 ms 5120 KB Output is correct
8 Correct 4 ms 5120 KB Output is correct
9 Correct 4 ms 5120 KB Output is correct
10 Correct 4 ms 5120 KB Output is correct
11 Correct 4 ms 5120 KB Output is correct
12 Correct 4 ms 5120 KB Output is correct
13 Correct 4 ms 5120 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 4 ms 5120 KB Output is correct
16 Correct 4 ms 5120 KB Output is correct
17 Correct 4 ms 5120 KB Output is correct
18 Correct 4 ms 5120 KB Output is correct
19 Correct 19 ms 5376 KB Output is correct
20 Correct 20 ms 5376 KB Output is correct
21 Correct 20 ms 5376 KB Output is correct
22 Correct 20 ms 5376 KB Output is correct
23 Correct 24 ms 7168 KB Output is correct
24 Correct 24 ms 7168 KB Output is correct
25 Correct 26 ms 7168 KB Output is correct
26 Correct 26 ms 7296 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5120 KB Output is correct
2 Correct 4 ms 5120 KB Output is correct
3 Correct 9 ms 5120 KB Output is correct
4 Correct 56 ms 5144 KB Output is correct
5 Correct 272 ms 5680 KB Output is correct
6 Correct 4 ms 5120 KB Output is correct
7 Correct 4 ms 5248 KB Output is correct
8 Correct 5 ms 5248 KB Output is correct
9 Correct 10 ms 5248 KB Output is correct
10 Correct 60 ms 5368 KB Output is correct
11 Correct 289 ms 5752 KB Output is correct
12 Correct 7 ms 7168 KB Output is correct
13 Correct 7 ms 7168 KB Output is correct
14 Correct 13 ms 7168 KB Output is correct
15 Correct 70 ms 7288 KB Output is correct
16 Correct 315 ms 7684 KB Output is correct
17 Correct 61 ms 40684 KB Output is correct
18 Correct 63 ms 41832 KB Output is correct
19 Correct 69 ms 41964 KB Output is correct
20 Correct 141 ms 42268 KB Output is correct
21 Correct 496 ms 43628 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5376 KB Output is correct
2 Correct 35 ms 5504 KB Output is correct
3 Correct 159 ms 5608 KB Output is correct
4 Correct 317 ms 5880 KB Output is correct
5 Correct 14 ms 9216 KB Output is correct
6 Correct 47 ms 9336 KB Output is correct
7 Correct 182 ms 9592 KB Output is correct
8 Correct 367 ms 10000 KB Output is correct
9 Correct 40 ms 22908 KB Output is correct
10 Correct 76 ms 22904 KB Output is correct
11 Correct 234 ms 23160 KB Output is correct
12 Correct 452 ms 23528 KB Output is correct
13 Correct 73 ms 40696 KB Output is correct
14 Correct 111 ms 42360 KB Output is correct
15 Correct 279 ms 43128 KB Output is correct
16 Correct 489 ms 43896 KB Output is correct
17 Correct 477 ms 43768 KB Output is correct

Subtask #5
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 571 ms 42104 KB Output is correct
2 Correct 565 ms 46200 KB Output is correct
3 Correct 570 ms 46072 KB Output is correct
4 Correct 574 ms 46012 KB Output is correct
5 Correct 553 ms 46072 KB Output is correct
6 Correct 534 ms 46220 KB Output is correct
7 Correct 632 ms 47344 KB Output is correct
8 Correct 638 ms 47224 KB Output is correct
9 Correct 601 ms 47340 KB Output is correct
10 Correct 606 ms 47224 KB Output is correct
11 Correct 616 ms 47348 KB Output is correct
12 Correct 593 ms 47088 KB Output is correct
13 Correct 673 ms 48608 KB Output is correct
14 Correct 663 ms 48756 KB Output is correct
15 Correct 651 ms 48504 KB Output is correct
16 Correct 654 ms 48632 KB Output is correct
17 Correct 676 ms 48632 KB Output is correct
18 Correct 613 ms 47600 KB Output is correct
19 Correct 688 ms 48568 KB Output is correct
20 Correct 652 ms 48504 KB Output is correct
21 Correct 652 ms 48632 KB Output is correct
22 Correct 659 ms 48632 KB Output is correct
23 Correct 665 ms 48472 KB Output is correct
24 Correct 617 ms 47596 KB Output is correct

Subtask #6
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5120 KB Output is correct
2 Correct 4 ms 5120 KB Output is correct
3 Correct 4 ms 5120 KB Output is correct
4 Correct 4 ms 5120 KB Output is correct
5 Correct 4 ms 5120 KB Output is correct
6 Correct 4 ms 5120 KB Output is correct
7 Correct 4 ms 5120 KB Output is correct
8 Correct 4 ms 5120 KB Output is correct
9 Correct 4 ms 5120 KB Output is correct
10 Correct 4 ms 5120 KB Output is correct
11 Correct 4 ms 5120 KB Output is correct
12 Correct 4 ms 5120 KB Output is correct
13 Correct 4 ms 5120 KB Output is correct
14 Correct 4 ms 5120 KB Output is correct
15 Correct 4 ms 5120 KB Output is correct
16 Correct 4 ms 5120 KB Output is correct
17 Correct 4 ms 5120 KB Output is correct
18 Correct 4 ms 5120 KB Output is correct
19 Correct 19 ms 5376 KB Output is correct
20 Correct 20 ms 5376 KB Output is correct
21 Correct 20 ms 5376 KB Output is correct
22 Correct 20 ms 5376 KB Output is correct
23 Correct 24 ms 7168 KB Output is correct
24 Correct 24 ms 7168 KB Output is correct
25 Correct 26 ms 7168 KB Output is correct
26 Correct 26 ms 7296 KB Output is correct
27 Correct 4 ms 5120 KB Output is correct
28 Correct 4 ms 5120 KB Output is correct
29 Correct 9 ms 5120 KB Output is correct
30 Correct 56 ms 5144 KB Output is correct
31 Correct 272 ms 5680 KB Output is correct
32 Correct 4 ms 5120 KB Output is correct
33 Correct 4 ms 5248 KB Output is correct
34 Correct 5 ms 5248 KB Output is correct
35 Correct 10 ms 5248 KB Output is correct
36 Correct 60 ms 5368 KB Output is correct
37 Correct 289 ms 5752 KB Output is correct
38 Correct 7 ms 7168 KB Output is correct
39 Correct 7 ms 7168 KB Output is correct
40 Correct 13 ms 7168 KB Output is correct
41 Correct 70 ms 7288 KB Output is correct
42 Correct 315 ms 7684 KB Output is correct
43 Correct 61 ms 40684 KB Output is correct
44 Correct 63 ms 41832 KB Output is correct
45 Correct 69 ms 41964 KB Output is correct
46 Correct 141 ms 42268 KB Output is correct
47 Correct 496 ms 43628 KB Output is correct
48 Correct 7 ms 5376 KB Output is correct
49 Correct 35 ms 5504 KB Output is correct
50 Correct 159 ms 5608 KB Output is correct
51 Correct 317 ms 5880 KB Output is correct
52 Correct 14 ms 9216 KB Output is correct
53 Correct 47 ms 9336 KB Output is correct
54 Correct 182 ms 9592 KB Output is correct
55 Correct 367 ms 10000 KB Output is correct
56 Correct 40 ms 22908 KB Output is correct
57 Correct 76 ms 22904 KB Output is correct
58 Correct 234 ms 23160 KB Output is correct
59 Correct 452 ms 23528 KB Output is correct
60 Correct 73 ms 40696 KB Output is correct
61 Correct 111 ms 42360 KB Output is correct
62 Correct 279 ms 43128 KB Output is correct
63 Correct 489 ms 43896 KB Output is correct
64 Correct 477 ms 43768 KB Output is correct
65 Correct 571 ms 42104 KB Output is correct
66 Correct 565 ms 46200 KB Output is correct
67 Correct 570 ms 46072 KB Output is correct
68 Correct 574 ms 46012 KB Output is correct
69 Correct 553 ms 46072 KB Output is correct
70 Correct 534 ms 46220 KB Output is correct
71 Correct 632 ms 47344 KB Output is correct
72 Correct 638 ms 47224 KB Output is correct
73 Correct 601 ms 47340 KB Output is correct
74 Correct 606 ms 47224 KB Output is correct
75 Correct 616 ms 47348 KB Output is correct
76 Correct 593 ms 47088 KB Output is correct
77 Correct 673 ms 48608 KB Output is correct
78 Correct 663 ms 48756 KB Output is correct
79 Correct 651 ms 48504 KB Output is correct
80 Correct 654 ms 48632 KB Output is correct
81 Correct 676 ms 48632 KB Output is correct
82 Correct 613 ms 47600 KB Output is correct
83 Correct 688 ms 48568 KB Output is correct
84 Correct 652 ms 48504 KB Output is correct
85 Correct 652 ms 48632 KB Output is correct
86 Correct 659 ms 48632 KB Output is correct
87 Correct 665 ms 48472 KB Output is correct
88 Correct 617 ms 47596 KB Output is correct
89 Correct 560 ms 45108 KB Output is correct
90 Correct 552 ms 45392 KB Output is correct
91 Correct 573 ms 45944 KB Output is correct
92 Correct 591 ms 46072 KB Output is correct
93 Correct 622 ms 47100 KB Output is correct
94 Correct 619 ms 46328 KB Output is correct
95 Correct 671 ms 46968 KB Output is correct
96 Correct 658 ms 46584 KB Output is correct
97 Correct 648 ms 46840 KB Output is correct
98 Correct 656 ms 47864 KB Output is correct
99 Correct 651 ms 46932 KB Output is correct
100 Correct 656 ms 46864 KB Output is correct