Submission #778594

#	Time	Username	Problem	Language	Result	Execution time	Memory
778594		loctildore	Fish (IOI08_fish)	C++14	0 / 100	50 ms	65536 KiB

fish

#include <bits/stdc++.h>
using namespace std;
// trans rights
#define ll long long
#define f first
#define s second
#define endl '\n'
#define all(x) begin(x), end(x)
int f, k, MOD;
struct node{
    int l, r;
    node *lft, *rht;
    int val;
    node(int tl, int tr): l(tl), r(tr), val(1) {
        if (l + 1 == r) {
            lft = rht = NULL;
            return;
        }
        lft = new node(l, (l + r) / 2);
        rht = new node((l + r) / 2, r);
    }

    void upd(int x, int tval) {
        if (x < l || x >= r) return;
        if (l + 1 == r) {
            val = tval % MOD;
            return;
        }
        lft->upd(x, tval);
        rht->upd(x, tval);
        val = (lft->val * rht->val) % MOD;
    }

    int fnd(int tl, int tr) {
        if (tr <= l || r <= tl) return 1;
        if (tl <= l && r <= tr) return val;
        return (lft->fnd(tl, tr) * rht->fnd(tl, tr)) % MOD;
    }
} *root;
int ans;
int maxi[500069], loc[500069];
int chng[500069];
int cnt[500069];
vector<int> vals[500069];
priority_queue<pair<int,int>> pq;
vector<pair<int,int>> ord;
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    freopen("fish.in", "r", stdin);
    freopen("fish.out", "w", stdout);
    cin>>f>>k>>MOD;
    root = new node(0, k);
    for (int i = 0; i < f; i++) {
        int a, b;
        cin>>a>>b; b--;
        maxi[b] = max(maxi[b], a);
        vals[b].push_back(a);
        pq.push({a, b});
    }
    for (int i = 0; i < k; i++) {
        ord.push_back({maxi[i], i});
    }
    sort(all(ord));
    for (int i = 0; i < k; i++) loc[ord[i].s] = i;
    for (int i = 0; i < k; i++) {
        sort(all(vals[i]));
        int t = *upper_bound(all(vals[i]), *vals[i].rbegin() / 2);
        chng[loc[i]] = lower_bound(all(ord), make_pair(t * 2, INT_MIN)) - begin(ord);
        cnt[loc[i]] = vals[i].size();
        root->upd(loc[i], cnt[loc[i]] + 1);
    }
    for (int i = k - 1; ~i; i--) {
        while (pq.size()) {
            auto t = pq.top();
            if (t.f * 2 <= ord[i].f) break;
            pq.pop();
            int pos = loc[t.s];
            cnt[pos]--;
            root->upd(pos, cnt[pos] + 1);
        }

        root->upd(i, 1);
        ans = (ans + root->fnd(0, chng[i])) % MOD;
        root->upd(i, cnt[i]);
        ans = (ans + root->fnd(0, i + 1)) % MOD;
        root->upd(i, cnt[i] + 1);
    }
    cout<<ans<<endl;
    return 0;
}

Compilation message (stderr)

fish.cpp: In function 'int main()':
fish.cpp:50:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |     freopen("fish.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
fish.cpp:51:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     freopen("fish.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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