Submission #1086710

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086710		djs100201	Fish (IOI08_fish)	C++17	0 / 100	195 ms	65536 KiB

fish

#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
using PP = pair<ll, P>;
const ll n_ = 5e5 + 10, inf = (ll)2e9 * (ll)1e9 + 7, mod = 998244353;
ll n, m, tc = 1, a, b, c, d, sum, x, y, z, base, ans, k;
ll mod1;
class seg {
   public:
    vector<ll> tree;
    ll base;
    seg(int n) {
        n++;
        for (base = 1; base <= n; base *= 2);
        tree.resize(n * 4);
        for (int i = 0; i < tree.size(); i++) tree[i] = 1;
    }
    ll f(ll l, ll r) {
        ll ret = 1;
        l += base, r += base;
        while (l <= r) {
            if (l % 2) ret = (ret * tree[l++]) % mod1;
            if (!(r % 2)) ret = (ret * tree[r--]) % mod1;
            l /= 2, r /= 2;
        }
        return ret;
    }
    void update(ll i, ll v) {
        i += base;
        tree[i] += v;
        i /= 2;
        while (i) {
            tree[i] = (tree[i * 2] * tree[i * 2 + 1]) % mod1;
            i /= 2;
        }
    }
};
vector<ll> color[n_];
void solve() {
    cin >> n >> k >> mod1;
    vector<P> v(n), I;
    vector<ll> cnt(n + 1), checked(n + 1), F(n + 1);
    seg ST(n + 1), ST2(n + 1);
    for (int i = 0; i < n; i++) {
        cin >> v[i].first >> v[i].second;
        cnt[v[i].second]++;
    }
    sort(all(v), greater<>());
    for (auto [a, b] : v) {
        if (checked[b]) continue;
        checked[b] = true;
        F[b] = I.size();
        color[F[b]].push_back(a);
        I.push_back({a, k - 1 - F[b]});
    }
    for (int i = 0; i < n_; i++) sort(all(color[i]));
    sort(all(I));
    ll idx = 0;
    reverse(all(v));
    for (auto [a, b] : I) {
        while (idx < v.size() && v[idx].first * 2 <= a) {
            ST.update(F[v[idx].second], 1);
            idx++;
        }
        ans = (ans + ST.f(0, b)) % mod1;
    }
    idx = 0;
    ll idx2 = 0;
    for (auto [a, b] : I) {
        while (idx < v.size() && v[idx].first * 2 <= a) {
            ST2.update(F[v[idx].second], 1);
            idx++;
        }
        x = *upper_bound(all(color[b]), a / 2);
        while (idx2 < I.size() && x * 2 <= I[idx2].first) idx2++;
        ll temp = ST2.f(0, b - 1);
        if (idx2) {
            temp = (temp * ST2.f(b + 1, I[idx2 - 1].second)) % mod1;
            ans += temp - 1;
            ans %= mod1;
        }
    }
    cout << ans << endl;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    // cin >> tc;
    while (tc--) solve();
};

Compilation message (stderr)

fish.cpp: In constructor 'seg::seg(int)':
fish.cpp:18:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |         for (int i = 0; i < tree.size(); i++) tree[i] = 1;
      |                         ~~^~~~~~~~~~~~~
fish.cpp: In function 'void solve()':
fish.cpp:63:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         while (idx < v.size() && v[idx].first * 2 <= a) {
      |                ~~~~^~~~~~~~~~
fish.cpp:72:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |         while (idx < v.size() && v[idx].first * 2 <= a) {
      |                ~~~~^~~~~~~~~~
fish.cpp:77:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |         while (idx2 < I.size() && x * 2 <= I[idx2].first) idx2++;
      |                ~~~~~^~~~~~~~~~

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