oj.uz

Submission #251812

# Submission time Handle Problem Language Result Execution time Memory
251812 2020-07-22T10:33:04 Z Vimmer Uzastopni (COCI15_uzastopni) C++14
136 / 160
 185 ms 2048 KB 
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define pf push_front
#define N 10010
#define M ll(10007)
#define inf 1e9 + 1e9

using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef short int si;
typedef array <int, 3> a3;
typedef array <int, 4> a4;
typedef pair <int, int> pt;
//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;


int n, ans, from[N], a[N], siz[N], h[N], l, r;

bool mk[105], mkr[105][105];

vector <int> val[105];

set <int> st[N];

vector <int> g[N];

bool bad;

void dfs_rev(int v)
{
    st[v].insert(a[v]);

    int lst = -1;

    for (auto it : st[v])
    {
        if (lst != -1 && it - lst != 1) {bad = 1; return;}

        lst = it;
    }

    if (v != 1)
    {
        int nxt = from[v];

        if (nxt == 0) {bad = 1; return;}

        if (sz(st[nxt]) < sz(st[v])) swap(st[v], st[nxt]);

        for (auto it : st[v]) st[nxt].insert(it);
    }
    else if (r - l + 1 != sz(st[v])) bad = 1;

}

bool cmp(int x, int y) {return h[x] > h[y];}
bool cmpr(int x, int y) {return h[x] < h[y];}

void dfs(int v)
{
    siz[v] = 1;

    for (auto it : g[v])
    {
        h[it] = h[v] + 1;

        dfs(it);

        siz[v] += siz[it];
    }
}

int main()
{
    //freopen("mining.in", "r", stdin); freopen("mining.out", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    srand(time(0));

    cin >> n;

    for (int i = 1; i <= n; i++) {cin >> a[i]; val[a[i]].pb(i); mk[a[i]] = 1;}

    for (int i = 1; i < n; i++)
    {
        int x, y;

        cin >> x >> y;

        g[x].pb(y);

        from[y] = x;
    }

    dfs(1);

    for (l = 1; l <= 100; l++)
      if (mk[l])
        for (r = l; r <= 100; r++)
        {
            if (!mk[r]) break;

            if (!(l <= a[1] && a[1] <= r)) continue;

            bad = 0;

            vector <int> gr; gr.clear();

            for (int i = 1; i <= n; i++) st[i].clear();

            for (int i = l; i <= r; i++) gr.pb(val[i][0]);

            sort(gr.begin(), gr.end(), cmp);

            for (auto it : gr) {dfs_rev(it); if (bad) break;}

            if (!bad) {mkr[l][r] = 1; ans++;}
        }

    for (int i = 1; i <= 100; i++) sort(val[i].begin(), val[i].end(), cmpr);

    for (l = 1; l <= 100; l++)
      if (mk[l])
        for (r = l; r <= 100; r++)
        {
            if (!mk[r]) break;

            if (mkr[l][r]) continue;

            if (!(l <= a[1] && a[1] <= r)) continue;

            bad = 0;

            vector <int> gr; gr.clear();

            for (int i = 1; i <= n; i++) st[i].clear();

            for (int i = l; i <= r; i++) gr.pb(val[i][0]);

            sort(gr.begin(), gr.end(), cmp);

            for (auto it : gr) {dfs_rev(it); if (bad) break;}

            if (!bad) {mkr[l][r] = 1; ans++;}
        }

//    for (l = 1; l <= 100; l++)
//      if (mk[l])
//        for (r = l; r <= 100; r++)
//        {
//            if (!mk[r]) break;
//
//            if (mkr[l][r]) continue;
//
//            if (!(l <= a[1] && a[1] <= r)) continue;
//
//            bad = 0;
//
//            vector <int> gr; gr.clear();
//
//            for (int i = 1; i <= n; i++) st[i].clear();
//
//            for (int i = l; i <= r; i++) gr.pb(val[i][rand() % sz(val[i])]);
//
//            sort(gr.begin(), gr.end(), cmp);
//
//            for (auto it : gr) {dfs_rev(it); if (bad) break;}
//
//            if (!bad) {mkr[l][r] = 1; ans++;}
//        }

    cout << ans << endl;
}

Subtask #1
136.0 / 160.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1024 KB Output is correct
2 Correct 1 ms 1024 KB Output is correct
3 Incorrect 1 ms 1024 KB Output isn't correct
4 Correct 1 ms 1024 KB Output is correct
5 Correct 1 ms 1024 KB Output is correct
6 Correct 15 ms 1024 KB Output is correct
7 Correct 18 ms 1024 KB Output is correct
8 Correct 6 ms 1132 KB Output is correct
9 Correct 1 ms 1024 KB Output is correct
10 Correct 1 ms 1024 KB Output is correct
11 Incorrect 6 ms 1408 KB Output isn't correct
12 Incorrect 6 ms 1408 KB Output isn't correct
13 Correct 6 ms 1408 KB Output is correct
14 Correct 185 ms 2048 KB Output is correct
15 Correct 128 ms 2048 KB Output is correct
16 Correct 177 ms 2048 KB Output is correct
17 Correct 5 ms 1408 KB Output is correct
18 Correct 5 ms 1408 KB Output is correct
19 Correct 96 ms 1280 KB Output is correct
20 Correct 96 ms 1400 KB Output is correct