Submission #763786

#	Time	Username	Problem	Language	Result	Execution time	Memory
763786		keta_tsimakuridze	Fish (IOI08_fish)	C++14	12 / 100	373 ms	30940 KiB

fish

#include<bits/stdc++.h>
#define f first
#define s second
#define int long long
#define pii pair<int,int>
using namespace std;
const int N = 2e5 + 5; // !
int t[4 * N], mod, f[N];
vector<int> x[N];
int id[N];
struct fish {
    int len, c;
} p[N];
int T = 0;
bool cmp(fish x, fish y) {
    return (y.len > x.len);
}
void build(int u, int l, int r) {
    t[u] = 1;
    if(l == r) return;
    int mid = (l + r) / 2;
    build(2 * u, l, mid);
    build(2 * u + 1, mid + 1, r);
}
void upd(int u, int id, int l, int r, int v) {
    if(l > id || r < id) return;
    if(l == r) {
        t[u] += v;
        if(t[u] < 1) t[u] = 1;
        return;
    }
    int mid = (l + r) / 2;
    if(id <= mid) upd(2 * u, id, l, mid, v); else upd(2 * u + 1, id, mid + 1, r, v);
    t[u] = t[2 * u] * t[2 * u + 1] % mod;
}
int get(int u, int st, int en, int l, int r) {
    if(l > en || r < st) return 1;
    if(st <= l && r <= en) return t[u] % mod;
    int mid = (l + r) / 2;
    return get(2 * u, st, en, l, mid) * get(2 * u + 1, st, en, mid + 1, r) % mod;
}
main(){
    int n, k;
    cin >> n >> k >> mod;
    for(int i = 1; i <= n; i++) {
        cin >> p[i].len >> p[i].c;
    }
    build(1, 1, k);
    sort(p + 1, p + n + 1, cmp);
    int K = k;
    for(int i = n; i >= 1; i--) {
        if(!f[p[i].c]) {
            f[p[i].c] = K--;
        }
    }
    for(int i = 1; i <= n; i++) p[i].c = f[p[i].c], x[p[i].c].push_back(i);
    for(int i = 1; i <= k; i++) f[i] = 0;
    int ans = 0, L = 0;
    while(L < n && p[L + 1].len * 2 <= p[n].len) ++L, upd(1, p[L].c, 1, k, 1);
    int l = L, R = n;
    vector<int> Lb(n + 2);
    for(int i = n; i >= 1; i--) {
        while(l > 0 && p[l].len * 2 > p[i].len) upd(1, p[l].c, 1, k, -1), --l;
        Lb[p[i].c] = l;
        if(!f[p[i].c]) {
            int X = x[p[i].c][get(1, p[i].c, p[i].c, 1, k) - 1];
            int l = p[i].c + 1, r = k, id = n + 1;
            while(l <= r) {
                int mid = (l + r) / 2;
                if(Lb[mid] >= X) id = mid, r = mid - 1;
                else l = mid + 1;
            }

            ans = (ans + get(1, 1, p[i].c - 1, 1, k) * get(1, p[i].c + 1, id - 1, 1, k) % mod) % mod;
            f[p[i].c] = i;
        }
    }
    build(1, 1, k);
    l = 0;
    while(l < n && p[l + 1].len * 2 <= p[n].len) ++l, upd(1, p[l].c, 1, k, 1);
    for(int i = n; i >= 1; i--) {
        while(l > 0 && p[l].len * 2 > p[i].len) upd(1, p[l].c, 1, k, -1), --l;
        if(f[p[i].c] == i) {
            ans = (ans + get(1, 1, p[i].c - 1, 1, k) * get(1, p[i].c + 1, k, 1, k) % mod
                   * (get(1, p[i].c, p[i].c, 1, k) - 1 + mod) % mod) % mod;
                   if(i == 1) T = 1;
            upd(1, p[i].c, 1, k, -n);
        }
    }
    cout << ans;
 }

 /*
5
3
7
2 2
5 1
8 3
4 1
2 3


5  3 7
2 2
2 3
4 1
5 1
8 3

 */

Compilation message (stderr)

fish.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main(){
      | ^~~~
fish.cpp: In function 'int main()':
fish.cpp:60:16: warning: unused variable 'R' [-Wunused-variable]
   60 |     int l = L, R = n;
      |                ^

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