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Submission #784367

# Submission time Handle Problem Language Result Execution time Memory
784367 2023-07-16T04:23:04 Z raysh07 File Paths (BOI15_fil) C++17
100 / 100
 59 ms 26064 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 604 KB Output is correct
3 Correct 2 ms 1108 KB Output is correct
4 Correct 3 ms 1500 KB Output is correct
5 Correct 5 ms 4828 KB Output is correct
6 Correct 5 ms 3412 KB Output is correct
7 Correct 5 ms 5332 KB Output is correct
8 Correct 3 ms 4436 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 1 ms 608 KB Output is correct
12 Correct 2 ms 1364 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 5472 KB Output is correct
2 Correct 11 ms 5460 KB Output is correct
3 Correct 11 ms 5600 KB Output is correct
4 Correct 11 ms 5588 KB Output is correct
5 Correct 59 ms 25300 KB Output is correct
6 Correct 55 ms 25588 KB Output is correct
7 Correct 36 ms 16136 KB Output is correct
8 Correct 36 ms 16468 KB Output is correct
9 Correct 11 ms 5156 KB Output is correct
10 Correct 10 ms 4564 KB Output is correct
11 Correct 8 ms 1492 KB Output is correct
12 Correct 46 ms 21976 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 604 KB Output is correct
3 Correct 2 ms 1108 KB Output is correct
4 Correct 3 ms 1500 KB Output is correct
5 Correct 5 ms 4828 KB Output is correct
6 Correct 5 ms 3412 KB Output is correct
7 Correct 5 ms 5332 KB Output is correct
8 Correct 3 ms 4436 KB Output is correct
9 Correct 4 ms 4564 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 1 ms 608 KB Output is correct
12 Correct 2 ms 1364 KB Output is correct
13 Correct 11 ms 5472 KB Output is correct
14 Correct 11 ms 5460 KB Output is correct
15 Correct 11 ms 5600 KB Output is correct
16 Correct 11 ms 5588 KB Output is correct
17 Correct 59 ms 25300 KB Output is correct
18 Correct 55 ms 25588 KB Output is correct
19 Correct 36 ms 16136 KB Output is correct
20 Correct 36 ms 16468 KB Output is correct
21 Correct 11 ms 5156 KB Output is correct
22 Correct 10 ms 4564 KB Output is correct
23 Correct 8 ms 1492 KB Output is correct
24 Correct 46 ms 21976 KB Output is correct
25 Correct 11 ms 5332 KB Output is correct
26 Correct 10 ms 5332 KB Output is correct
27 Correct 10 ms 5464 KB Output is correct
28 Correct 10 ms 5596 KB Output is correct
29 Correct 54 ms 25552 KB Output is correct
30 Correct 55 ms 25464 KB Output is correct
31 Correct 40 ms 16312 KB Output is correct
32 Correct 41 ms 16052 KB Output is correct
33 Correct 9 ms 4484 KB Output is correct
34 Correct 9 ms 4580 KB Output is correct
35 Correct 6 ms 1508 KB Output is correct
36 Correct 59 ms 26064 KB Output is correct