Submission #983485

#	Time	Username	Problem	Language	Result	Execution time	Memory
983485		sleepntsheep	Game (APIO22_game)	C++17	2 / 100	8 ms	21692 KiB

game

#include "game.h"
#include <string>
#include <algorithm>

#define N 300000

std::basic_string<int> g[N], gt[N];
int n, k, from[N], to[N], cyclic, lvl[N];

int msb(int x) {
    return x ? 0 : 1 + msb(x >> 1);
}

void init(int n_, int k_) {
    n = n_, k = k_;
    for (int i = 0; i < k; ++i)
        to[i] = i, from[i] = i + 1;
    for (int i = k; i < n; ++i)
        from[i] = k, to[i] = -1;
    for (int i = 0; i < n; ++i)
        lvl[i] = msb(from[i] ^ to[i]);
}

void check(int u) {
    if (to[u] >= from[u] || cyclic) {
        cyclic = 86;
        return;
    }
    int d = msb(from[u] ^ to[u]);
    if (d > lvl[u]) {
        lvl[u] = d;
        for (auto v : g[u]) {
            to[v] = std::max(to[v], to[u]);
            check(v);
        }
        for (auto v : gt[u]) {
            from[v] = std::min(from[v], from[u]);
            check(v);
        }
    }
}

int add_teleporter(int u, int v) {
    if (cyclic)
        return 1;
    g[u].push_back(v);
    gt[v].push_back(u);

    to[v] = std::max(to[v], to[u]);
    from[u] = std::min(from[u], from[v]);
    if (u < k) to[v] = std::max(to[v], u);
    if (v < k) from[u] = std::min(from[u], v);

    check(u);
    check(v);

    return !!cyclic;
}

• Subtask 1: 2 / 2
• Subtask 2: 0 / 10
• Subtask 3: 0 / 18
• Subtask 4: 0 / 30
• Subtask 5: 0 / 40