Submission #945997

#	Time	Username	Problem	Language	Result	Execution time	Memory
945997		itslq	Road Construction (JOI21_road_construction)	C++17	Compilation error	0 ms	0 KiB

road_construction

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
 
int N, K, X, Y;
vector<int> x(3e5), y(3e5);
map<int, map<int, int>> 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 = unordered_map<int, unordered_map<int, int>>();
 
    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;
}

Compilation message (stderr)

road_construction.cpp: In function 'bool check(long long int)':
road_construction.cpp:54:59: error: no match for 'operator=' (operand types are 'std::map<long long int, std::map<long long int, long long int> >' and 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >')
   54 |     fenwick = unordered_map<int, unordered_map<int, int>>();
      |                                                           ^
In file included from /usr/include/c++/10/map:61,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:81,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_map.h:319:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(const std::map<_Key, _Tp, _Compare, _Alloc>&) [with _Key = long long int; _Tp = std::map<long long int, long long int>; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::map<long long int, long long int> > >]'
  319 |       operator=(const map&) = default;
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_map.h:319:17: note:   no known conversion for argument 1 from 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' to 'const std::map<long long int, std::map<long long int, long long int> >&'
  319 |       operator=(const map&) = default;
      |                 ^~~~~~~~~~
/usr/include/c++/10/bits/stl_map.h:323:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(std::map<_Key, _Tp, _Compare, _Alloc>&&) [with _Key = long long int; _Tp = std::map<long long int, long long int>; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::map<long long int, long long int> > >]'
  323 |       operator=(map&&) = default;
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_map.h:323:17: note:   no known conversion for argument 1 from 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' to 'std::map<long long int, std::map<long long int, long long int> >&&'
  323 |       operator=(map&&) = default;
      |                 ^~~~~
/usr/include/c++/10/bits/stl_map.h:337:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(std::initializer_list<std::pair<const _Key, _Tp> >) [with _Key = long long int; _Tp = std::map<long long int, long long int>; _Compare = std::less<long long int>; _Alloc = std::allocator<std::pair<const long long int, std::map<long long int, long long int> > >]'
  337 |       operator=(initializer_list<value_type> __l)
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_map.h:337:46: note:   no known conversion for argument 1 from 'std::unordered_map<long long int, std::unordered_map<long long int, long long int> >' to 'std::initializer_list<std::pair<const long long int, std::map<long long int, long long int> > >'
  337 |       operator=(initializer_list<value_type> __l)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~