oj.uz

Submission #358313

# Submission time Handle Problem Language Result Execution time Memory
358313 2021-01-25T10:11:32 Z Vladth11 Watching (JOI13_watching) C++14
100 / 100
 258 ms 9472 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define debug(x) cerr << #x << " " << x << "\n"
#define debug_with_space(x) cerr << #x << " " << x << " "

using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair <ll, ll> pii;
typedef pair <ll, pii> piii;
typedef tree <pii, null_type, less <pii>, rb_tree_tag, tree_order_statistics_node_update> OST;

const ll NMAX = 2001;
const ll INF = (1LL << 60);
const ll MOD = 1000000007;
const ll BLOCK = 101;
const ll nr_of_bits = 35;

int n, p, q, pp, qq;
int v[NMAX];
int next2w[NMAX];
int nextw[NMAX];
int dp[2001][2001];

bool OK(int w) {
    for(int i = 0; i <= p; i++) {
        for(int j = 0; j <= q; j++) {
            dp[i][j] = 0;
        }
    }
    int r = 0, r1 = 0;
    for(int i = 1; i <= n; i++) {
        while(r < n && v[r + 1] < v[i] + w)
            r++;
        nextw[i] = r;
        while(r1 < n && v[r1 + 1] < v[i] + 2 * w)
            r1++;
        next2w[i] = r1;
    }
    for(int i = 0; i <= p; i++) {
        for(int j = 0; j <= q; j++) {
            if(i != 0) {
                dp[i][j] = max(dp[i][j], dp[i - 1][j]);
                int unde = dp[i - 1][j];
                unde++;
                int r = nextw[unde];
                dp[i][j] = max(dp[i][j], dp[i - 1][j] + (r - unde + 1));
            }
            if(j != 0) {
                int unde = dp[i][j - 1];
                dp[i][j] = max(dp[i][j], dp[i][j - 1]);
                unde++;
                int r = next2w[unde];
                dp[i][j] = max(dp[i][j], dp[i][j - 1] + (r - unde + 1));
            }
        }
    }
    return (dp[p][q] >= n);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int i;
    cin >> n >> p >> q;
    pp = p;
    qq = q;
    for(i = 1; i <= n; i++) {
        cin >> v[i];
    }
    sort(v + 1, v + n + 1);
    p = min(p, n);
    q = min(q, max(0, n - p));
    int r = 0, pas = (1 << 29);
    while(pas) {
        if(!OK(r + pas))
            r += pas;
        pas /= 2;
    }
    cout << r + 1;
    return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 748 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 748 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 656 KB Output is correct
12 Correct 1 ms 620 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 208 ms 9472 KB Output is correct
4 Correct 9 ms 8428 KB Output is correct
5 Correct 39 ms 1004 KB Output is correct
6 Correct 8 ms 8428 KB Output is correct
7 Correct 3 ms 492 KB Output is correct
8 Correct 26 ms 1260 KB Output is correct
9 Correct 30 ms 3820 KB Output is correct
10 Correct 54 ms 8684 KB Output is correct
11 Correct 43 ms 1132 KB Output is correct
12 Correct 258 ms 8044 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 1 ms 512 KB Output is correct