oj.uz

Submission #638606

# Submission time Handle Problem Language Result Execution time Memory
638606 2022-09-06T13:03:06 Z BhavayGoyal Regions (IOI09_regions) C++14
18 / 100
 1863 ms 131072 KB 
#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class T> using oset = 
            tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define endl "\n"

const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;

const int d4i[4]={-1, 0, 1, 0}, d4j[4]={0, 1, 0, -1};
const int d8i[8]={-1, -1, 0, 1, 1, 1, 0, -1}, d8j[8]={0, 1, 1, 1, 0, -1, -1, -1};


// -------------------------------------------------- Main Code --------------------------------------------------

const int N = 2e5+5;
vi g[N], members[N];
int region[N], tin[N], tout[N], tarr[8*N], timer = 1;

struct segTree {
    int n;
    vector<unordered_map<int, int>> tree;
    segTree (int N) {n = 1; while (n < N) n *= 2; tree = vector<unordered_map<int, int>>(2*n+2);}
 
    void build(int node, int left, int right, int arr[]) {
        if (left == right) {if (arr[left] != -1) tree[node][arr[left]]++; return;}
        build(node*2, left, (left+right)/2, arr);
        build(node*2+1, (left+right)/2+1, right, arr);
        for (auto i : tree[node*2]) tree[node][i.f] += i.s;
        for (auto i : tree[node*2+1]) tree[node][i.f] += i.s;
    }
    void build(int arr[]) {build(1, 1, n, arr);}
 
    int query(int node, int left, int right, int l, int r, int val) {
        if (left > r || right < l) return 0;
        else if (left >= l && right <= r) return tree[node][val];
        else return query(node*2, left, (left+right)/2, l, r, val) + query(node*2+1, (left+right)/2+1, right, l, r, val);
    }
    int query(int left, int right, int val) {return query(1, 1, n, left, right, val);}
};

void dfs(int src, int par) {
    tarr[timer] = region[src];
    tin[src] = timer++;
    for (auto ch : g[src]) if (ch != par) dfs(ch, src);
    tout[src] = timer-1;
}

vi largeregions;
vii preProcessing;

void dfs2(int src, int par, int i, int ct = 0) {
    for (auto ch : g[src]) {
        if (ch == par) continue;
        preProcessing[i][region[ch]] += ct;
        dfs2(ch, src, i, ct+(largeregions[i]==region[ch]));
    }
}

void sol() {
    int n, r, q; cin >> n >> r >> q;
    int sqn = sqrt(n)+1;
    for (int i = 1; i <= n; i++) {
        if (i == 1) cin >> region[i];
        else {
            int x; cin >> x >> region[i];
            g[i].pb(x);
            g[x].pb(i);
        }
        members[region[i]].pb(i);
    }

    dfs(1, -1);
    segTree tree(n); tree.build(tarr);

    for (int i = 1; i <= r; i++) if (members[i].size() >= sqn) largeregions.pb(i);
    preProcessing = vii(largeregions.size(), vi(r+1, 0));
    for (int i = 0; i < largeregions.size(); i++) dfs2(1, -1, i, (largeregions[i]==region[1]));

    while (q--) {
        int a, b; cin >> a >> b;
        int idx = lower_bound(all(largeregions), a) - largeregions.begin();
        if (idx < largeregions.size() && largeregions[idx] == a) {
            cout << preProcessing[idx][b] << endl;
            continue;
        }

        int ans = 0;
        for (auto ch : members[a]) ans += tree.query(tin[ch], tout[ch], b);
        cout << ans << endl;
    }
}

int main () {
    // ios_base::sync_with_stdio(false);
    // cin.tie(NULL);
    int t = 1;
    // cin >> t; 
    while (t--) {
        sol();
    }
    return 0;
}

Compilation message

regions.cpp: In function 'void sol()':
regions.cpp:93:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   93 |     for (int i = 1; i <= r; i++) if (members[i].size() >= sqn) largeregions.pb(i);
      |                                      ~~~~~~~~~~~~~~~~~~^~~~~~
regions.cpp:95:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for (int i = 0; i < largeregions.size(); i++) dfs2(1, -1, i, (largeregions[i]==region[1]));
      |                     ~~^~~~~~~~~~~~~~~~~~~~~
regions.cpp:100:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  100 |         if (idx < largeregions.size() && largeregions[idx] == a) {
      |             ~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9680 KB Output is correct
2 Correct 5 ms 9680 KB Output is correct
3 Correct 6 ms 9760 KB Output is correct
4 Correct 13 ms 9936 KB Output is correct
5 Correct 17 ms 10384 KB Output is correct
6 Correct 25 ms 11016 KB Output is correct
7 Correct 47 ms 13360 KB Output is correct
8 Correct 69 ms 14596 KB Output is correct
9 Correct 144 ms 23448 KB Output is correct
10 Correct 375 ms 39740 KB Output is correct
11 Correct 1151 ms 70380 KB Output is correct
12 Correct 1342 ms 86060 KB Output is correct
13 Correct 1410 ms 97260 KB Output is correct
14 Runtime error 1863 ms 131072 KB Execution killed with signal 9
15 Runtime error 1497 ms 131072 KB Execution killed with signal 9

Subtask #2
5.0 / 85.0

# Verdict Execution time Memory Grader output
1 Runtime error 1209 ms 131072 KB Execution killed with signal 9
2 Runtime error 1109 ms 131072 KB Execution killed with signal 9
3 Runtime error 859 ms 131072 KB Execution killed with signal 9
4 Runtime error 1445 ms 131072 KB Execution killed with signal 9
5 Runtime error 1400 ms 131072 KB Execution killed with signal 9
6 Correct 1134 ms 77088 KB Output is correct
7 Runtime error 1126 ms 131072 KB Execution killed with signal 9
8 Runtime error 764 ms 131072 KB Execution killed with signal 9
9 Runtime error 273 ms 131072 KB Execution killed with signal 9
10 Runtime error 276 ms 131072 KB Execution killed with signal 9
11 Runtime error 307 ms 131072 KB Execution killed with signal 9
12 Runtime error 311 ms 131072 KB Execution killed with signal 9
13 Runtime error 300 ms 131072 KB Execution killed with signal 9
14 Runtime error 308 ms 131072 KB Execution killed with signal 9
15 Runtime error 296 ms 131072 KB Execution killed with signal 9
16 Runtime error 281 ms 131072 KB Execution killed with signal 9
17 Runtime error 289 ms 131072 KB Execution killed with signal 9