Submission #114291

#	Time	Username	Problem	Language	Result	Execution time	Memory
114291		popovicirobert	Sails (IOI07_sails)	C++14	100 / 100	86 ms	2816 KiB

sails

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
// 217
// 44

using namespace std;

const int MAXH = (int) 1e5;

struct Fenwick {
    vector <int> aib;
    int n;

    inline void init(int _n) {
        n = _n;
        aib.resize(n + 1, 0);
    }

    inline void update(int pos, int val) {
        for(int i = pos; i <= n; i += lsb(i)) {
            aib[i] += val;
        }
    }

    inline int query(int pos) {
        int ans = 0;
        for(int i = pos; i > 0; i -= lsb(i)) {
            ans += aib[i];
        }
        return ans;
    }
};


int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    cin >> n;

    vector <int> h(n + 1), k(n + 1), ord(n + 1);
    for(i = 1; i <= n; i++) {
        cin >> h[i] >> k[i];
        ord[i] = i;
    }

    sort(next(ord.begin()), ord.end(), [&](const int &a, const int &b) {

            return h[a] < h[b];

         });

    Fenwick fen; fen.init(MAXH);

    for(i = 1; i <= n; i++) {
        int val = fen.query(h[ord[i]] - k[ord[i]] + 1);

        int l = 0, r = 0;
        for(int step = 1 << 16; step; step >>= 1) {
            if(l + step <= h[ord[i]] && fen.query(l + step) > val) {
                l += step;
            }
            if(r + step <= h[ord[i]] && fen.query(r + step) >= val) {
                r += step;
            }
        }

        l++;
        fen.update(r + 1, 1), fen.update(h[ord[i]] + 1, -1);
        fen.update(l, 1), fen.update(l + k[ord[i]] - (h[ord[i]] - r), -1);

    }

    ll ans = 0;
    for(i = 1; i <= MAXH; i++) {
        int cur = fen.query(i);
        ans += 1LL * cur * (cur - 1) / 2;
    }

    cout << ans;

    //cin.close();
    //cout.close();
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10