oj.uz

Submission #770912

# Submission time Handle Problem Language Result Execution time Memory
770912 2023-07-02T06:31:10 Z joshuaZ Road Construction (JOI21_road_construction) C++17
0 / 100
 10000 ms 51792 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
const int mxN = 250002;

int n, k;
multiset<ll> path;
pll a[mxN];


bool solve(ll d){
    set<pll> st;
    for (int i = 1, j = 1; i <= n; i++){
        while (a[i].first - a[j].first > d){
            st.erase({a[j].second, a[j].first});
            j++;
        }
        auto l = st.lower_bound({a[i].second - d, -1e10});
        auto r = st.upper_bound({a[i].second + d, -1e10});
        for (auto it = l; it != r; it++){
            path.insert(max(abs((*it).second - a[i].first), abs((*it).first - a[i].second)));
            if (path.size() >= 4 * mxN){
                return true;
            }
        }
        st.insert({a[i].second, a[i].first});
    }

    if (path.size() >= k){
        return true;
    } else {
        return false;
    }
}

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

    cin >> n >> k;
    //xi + yi - (xj + yj) <= val
    //xi - yi - (xj - yj) <= val
    for (int i = 1; i <= n; i++){
        ll x, y; cin >> x >> y;
        a[i].first = x + y;
        a[i].second = x - y;
    }
    sort(a + 1, a + 1 + n);

    ll lo = 1, hi = 2e9, ans = -1;
    while (lo <= hi){
        ll mid = lo + (hi - lo) / 2;
        if (solve(mid)){
            ans = mid;
            hi = mid - 1;
        } else {
            lo = mid + 1;
        }
        path.clear();
    }

    solve(ans);

    int c = 1;
    for (auto &x : path){
        cout << x << '\n';
        if (c++ >= k){
            break;
        }
    }
}

Compilation message

road_construction.cpp: In function 'bool solve(ll)':
road_construction.cpp:30:21: warning: comparison of integer expressions of different signedness: 'std::multiset<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |     if (path.size() >= k){
      |         ~~~~~~~~~~~~^~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3015 ms 17420 KB Output is correct
2 Correct 2991 ms 17276 KB Output is correct
3 Incorrect 1905 ms 10208 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 6.0

# Verdict Execution time Memory Grader output
1 Execution timed out 10056 ms 51748 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 8111 ms 51792 KB Output is correct
2 Correct 8064 ms 51788 KB Output is correct
3 Incorrect 2 ms 212 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 8111 ms 51792 KB Output is correct
2 Correct 8064 ms 51788 KB Output is correct
3 Incorrect 2 ms 212 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 3015 ms 17420 KB Output is correct
2 Correct 2991 ms 17276 KB Output is correct
3 Incorrect 1905 ms 10208 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3015 ms 17420 KB Output is correct
2 Correct 2991 ms 17276 KB Output is correct
3 Incorrect 1905 ms 10208 KB Output isn't correct
4 Halted 0 ms 0 KB -