oj.uz

Submission #946121

# Submission time Handle Problem Language Result Execution time Memory
946121 2024-03-14T10:36:02 Z itslq Road Construction (JOI21_road_construction) C++17
0 / 100
 1084 ms 2097156 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
 
int N, K, X, Y;
vector<int> x, y;
vector<vector<signed>> fenwick;
 
void update(int i, int j1, bool b) {
    for (; i <= X; i += i & -i) {
        for (int j = j1; j <= Y; j += j & -j) {
            if (b) fenwick[i][j]++;
            else fenwick[i][j]--;
        }
    }
}
 
int query(int i, int j1) {
    int S = 0;
    for (; i > 0; i -= i & -i) {
        for (int j = j1; j > 0; j -= j & -j) {
            S += fenwick[i][j];
        }
    }
    return S;
}
 
bool check(int d) {
    int x1, y1, S = 0, ia, ib, ic, id;
 
    vector<int> xdisc, ydisc;
 
    for (int i = 0; i < N; i++) {
        x1 = x[i];
        y1 = y[i];
 
        xdisc.push_back(x1 - y1 - d);
        xdisc.push_back(x1 - y1);
        xdisc.push_back(x1 - y1 + d);
        ydisc.push_back(x1 + y1 - d);
        ydisc.push_back(x1 + y1);
        ydisc.push_back(x1 + y1 + d);
    }
 
    sort(xdisc.begin(), xdisc.end());
    sort(ydisc.begin(), ydisc.end());
 
    xdisc.erase(unique(xdisc.begin(), xdisc.end()), xdisc.end());
    ydisc.erase(unique(ydisc.begin(), ydisc.end()), ydisc.end());
 
    X = xdisc.size();
    Y = ydisc.size();
    fenwick = vector<vector<signed>>(X + 1, vector<signed>(Y + 1));
 
    for (int i = 0; i < N; i++) {
        x1 = x[i];
        y1 = y[i];
 
        ia = lower_bound(xdisc.begin(), xdisc.end(), x1 - y1) - xdisc.begin() + 1;
        ib = lower_bound(ydisc.begin(), ydisc.end(), x1 + y1) - ydisc.begin() + 1;
 
        if ((S += query(ia, ib)) >= K) return true;
 
        ia = lower_bound(xdisc.begin(), xdisc.end(), x1 - y1 - d) - xdisc.begin() + 1;
        ib = lower_bound(xdisc.begin(), xdisc.end(), x1 - y1 + d) - xdisc.begin() + 1;
        ic = lower_bound(ydisc.begin(), ydisc.end(), x1 + y1 - d) - ydisc.begin() + 1;
        id = lower_bound(ydisc.begin(), ydisc.end(), x1 + y1 + d) - ydisc.begin() + 1;
 
        update(ia, ic, 1);
        update(ib + 1, ic, 0);
        update(ia, id + 1, 0);
        update(ib + 1, id + 1, 1);
    }
 
    return false;
}
 
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
 
    cin >> N  >> K;
    x.resize(N);
    y.resize(N);
    for (int i = 0; i < N; i++) cin >> x[i] >> y[i];
 
    int l = 0, r = 4e9, m, ans;
    while (l <= r) {
        m = (l + r) >> 1;
        if (check(m)) {
            ans = m;
            r = --m;
        } else {
            l = ++m;
        }
    }
 
    cout << ans;
    return 0;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 356 ms 71292 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 6.0

# Verdict Execution time Memory Grader output
1 Runtime error 1084 ms 2097156 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #3
0 / 7.0

# Verdict Execution time Memory Grader output
1 Runtime error 755 ms 2097152 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 755 ms 2097152 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 356 ms 71292 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 356 ms 71292 KB Output isn't correct
2 Halted 0 ms 0 KB -