Submission #692842

#	Time	Username	Problem	Language	Result	Execution time	Memory
692842		saayan007	Lightning Rod (NOI18_lightningrod)	C++17	19 / 100	2093 ms	175688 KiB

Main

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vpi = vector<pi>;
using vpl = vector<pl>;

#define fur(i, a, b) for(ll i = a; i <= (ll) b; ++i)
#define ruf(i, a, b) for(ll i = a; i >= (ll) b; --i)
#define fr first
#define sc second
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define nl "\n"

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    ll n;
    cin >> n;

    ll x[n + 1], y[n + 1];
    fur(i, 1, n) {
        cin >> x[i] >> y[i];
    }

    ll ans = n;
    fur(i, 0, (1 << n) - 1) {
        bool rod[n + 1] = {};
        bool prot[n + 1] = {};
        fur(j, 0, n - 1) {
            if(i & (1 << j))
                rod[j + 1] = 1;
        }

        fur(j, 1, n) {
            if(!rod[j])
                continue;
            fur(k, 1, n) {
                if(abs(x[k] - x[j]) <= y[j] - y[k])
                    prot[k] = 1;
            }
        }

        bool all = 1;
        fur(j, 1, n)
            all &= prot[j];
        if(all) {
            ans = min(ans, (ll)__builtin_popcountll(i));
        }
    }
    cout << ans << nl;
}

• Subtask 1: 0 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 0 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20