Submission #711797

#	Time	Username	Problem	Language	Result	Execution time	Memory
711797		becaido	Zvijezda (COCI19_zvijezda)	C++17	110 / 110	139 ms	7988 KiB

zvijezda

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include <bits/stdc++.h>
using namespace std;

#ifdef WAIMAI
#define debug(HEHE...) cout << "[" << #HEHE << "] : ", dout(HEHE)
void dout() {cout << '\n';}
template<typename T, typename...U>
void dout(T t, U...u) {cout << t << (sizeof... (u) ? ", " : ""), dout (u...);}
#else
#define debug(...) 7122
#endif

#define ll long long
#define Waimai ios::sync_with_stdio(false), cin.tie(0)
#define FOR(x,a,b) for (int x = a, I = b; x <= I; x++)
#define pb emplace_back
#define F first
#define S second

#define int long long

using i128 = __int128;
using point = pair<int, int>;

const int SIZE = 1e5 + 5;

int t, n, q, cur;
point p[SIZE];

i128 cross(point a, point b) {
    return (i128) a.F * b.S - (i128) a.S * b.F;
}

point operator - (point a, point b) {
    return point(a.F - b.F, a.S - b.S);
}

bool check(point P, int i) {
    int j = i + 1 > n ? 1 : i + 1;
    return cross(P - p[i], P - p[j]) > 0;
}

void solve() {
    cin >> t >> n;
    FOR (i, 1, n) cin >> p[i].F >> p[i].S;
    cin >> q;
    while (q--) {
        point P;
        cin >> P.F >> P.S;
        P.F ^= t * cur * cur * cur;
        P.S ^= t * cur * cur * cur;
        int x = check(P, 1), y = check(P, n / 2 + 1);
        if (x == y) {
            if (x) cout << "DA\n", cur++;
            else cout << "NE\n";
            continue;
        }
        int xl = 1, xr = n / 2;
        while (xl < xr) {
            int mid = (xl + xr) / 2 + 1;
            if (check(P, mid) == x) xl = mid;
            else xr = mid - 1;
        }
        int yl = n / 2 + 1, yr = n;
        while (yl < yr) {
            int mid = (yl + yr) / 2 + 1;
            if (check(P, mid) == y) yl = mid;
            else yr = mid - 1;
        }
        int len;
        if (x == 1) len = xl + n - yl;
        else len = yl - xl;
        if (len > n / 2) cout << "DA\n", cur++;
        else cout << "NE\n";
    }
}

int32_t main() {
    Waimai;
    solve();
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 60 / 60