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Submission #727941

# Submission time Handle Problem Language Result Execution time Memory
727941 2023-04-21T16:01:49 Z _martynas File Paths (BOI15_fil) C++11
100 / 100
 87 ms 26096 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
using vl = vector<ll>;

const int MOD = 1e9+7;

#define F first
#define S second
#define PB push_back
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()

const int MXN = 6005;
const int MXR = 1e6+5;

int n, m, k, s;
vi adj[MXN];
ll len[MXN], path[MXN];
bool path_present[MXR];
bool ans[MXN];
vi cycles[MXN];
int cycle_cnt[MXR];

vi up;
void init_cycles(int u, int p) {
    if(u > n) return;
    up.PB(u);
    for(int v : up) {
        cycles[v].PB(path[u]-path[v]+s);
    }
    for(int v : adj[u]) if(v != p) {
        init_cycles(v, u);
    }
    up.pop_back();
}

void upd(int sum, int change) {
    if(sum >= MXR) return;
    cycle_cnt[sum] += change;
}

vi get_divs(int sum) {
    vi divs;
    for(int i = 1; i*i <= sum; i++) {
        if(sum % i) continue;
        divs.PB(i);
        if(i != sum/i) divs.PB(sum/i);
    }
    return divs;
}

void dfs(int u, int p) {
    up.PB(u);
    if(u > n) {
        ans[u] = path[u] == k;
        for(int v : up) {
            if(k-(path[u]-path[v]+len[v]+s) >= 0
               && path_present[k-(path[u]-path[v]+len[v]+s)])
                ans[u] = true;
        }
        if(path[u] < k) {
            vi divs = get_divs(k-path[u]);
            for(int x : divs) {
                if(cycle_cnt[x]) ans[u] = true;
            }
        }
        up.pop_back();
        return;
    }
    for(int sum : cycles[u]) upd(sum, 1);
    for(int v : adj[u]) if(v != p) {
        dfs(v, u);
    }
    up.pop_back();
    for(int sum : cycles[u]) upd(sum, -1);
}

int main() {
    cin >> n >> m >> k >> s; s++;
    path_present[0] = true;
    for(int i = 1; i <= n; i++) {
        int p; cin >> p >> len[i]; len[i]++;
        adj[p].PB(i);
        path[i] += path[p]+len[i];
        path_present[path[i]] = true;
    }
    for(int i = n+1; i <= n+m; i++) {
        int p; cin >> p >> len[i]; len[i]++;
        adj[p].PB(i);
        path[i] += path[p]+len[i];
    }
    init_cycles(0, -1);
    dfs(0, -1);
    for(int i = n+1; i <= n+m; i++) cout << (ans[i] ? "YES\n" : "NO\n");
    return 0;
}

/*



*/

Subtask #1
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 2 ms 1108 KB Output is correct
4 Correct 3 ms 1492 KB Output is correct
5 Correct 6 ms 4812 KB Output is correct
6 Correct 5 ms 3412 KB Output is correct
7 Correct 7 ms 5332 KB Output is correct
8 Correct 4 ms 4452 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 2 ms 596 KB Output is correct
12 Correct 3 ms 1372 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 5532 KB Output is correct
2 Correct 13 ms 5460 KB Output is correct
3 Correct 13 ms 5708 KB Output is correct
4 Correct 14 ms 5588 KB Output is correct
5 Correct 87 ms 25412 KB Output is correct
6 Correct 87 ms 25572 KB Output is correct
7 Correct 53 ms 16076 KB Output is correct
8 Correct 56 ms 16484 KB Output is correct
9 Correct 13 ms 5204 KB Output is correct
10 Correct 13 ms 4564 KB Output is correct
11 Correct 7 ms 1480 KB Output is correct
12 Correct 73 ms 22000 KB Output is correct

Subtask #3
34.0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 2 ms 1108 KB Output is correct
4 Correct 3 ms 1492 KB Output is correct
5 Correct 6 ms 4812 KB Output is correct
6 Correct 5 ms 3412 KB Output is correct
7 Correct 7 ms 5332 KB Output is correct
8 Correct 4 ms 4452 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 2 ms 596 KB Output is correct
12 Correct 3 ms 1372 KB Output is correct
13 Correct 15 ms 5532 KB Output is correct
14 Correct 13 ms 5460 KB Output is correct
15 Correct 13 ms 5708 KB Output is correct
16 Correct 14 ms 5588 KB Output is correct
17 Correct 87 ms 25412 KB Output is correct
18 Correct 87 ms 25572 KB Output is correct
19 Correct 53 ms 16076 KB Output is correct
20 Correct 56 ms 16484 KB Output is correct
21 Correct 13 ms 5204 KB Output is correct
22 Correct 13 ms 4564 KB Output is correct
23 Correct 7 ms 1480 KB Output is correct
24 Correct 73 ms 22000 KB Output is correct
25 Correct 14 ms 5268 KB Output is correct
26 Correct 12 ms 5440 KB Output is correct
27 Correct 12 ms 5460 KB Output is correct
28 Correct 14 ms 5588 KB Output is correct
29 Correct 84 ms 25560 KB Output is correct
30 Correct 82 ms 25480 KB Output is correct
31 Correct 54 ms 16300 KB Output is correct
32 Correct 56 ms 16056 KB Output is correct
33 Correct 10 ms 4564 KB Output is correct
34 Correct 10 ms 4648 KB Output is correct
35 Correct 7 ms 1492 KB Output is correct
36 Correct 85 ms 26096 KB Output is correct