Submission #674918

#	Time	Username	Problem	Language	Result	Execution time	Memory
674918		stevancv	Arcade (NOI20_arcade)	C++14	100 / 100	198 ms	18444 KiB

Arcade

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 3e5 + 2;
const int mod = 1e9 + 7;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin >> m >> n;
    vector<int> a(n), b(n);
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) cin >> b[i];
    vector<int> c(n);
    iota(c.begin(), c.end(), 0);
    sort(c.begin(), c.end(), [&] (int i, int j) {
        if (a[i] + b[i] != a[j] + b[j]) return a[i] + b[i] < a[j] + b[j];
        return b[i] - a[i] > b[j] - a[j];
    });
    vector<int> v;
    for (int i : c) v.push_back(b[i] - a[i]);
    vector<int> lis(n + 1, 2e9 + 1);
    lis[0] *= -1;
    int sol = 0;
    for (int i = 0; i < n; i++) {
        int l = 1, r = i, ans = 1;
        while (l <= r) {
            int mid = l + r >> 1;
            if (lis[mid] < v[i]) {
                l = mid + 1;
                ans = mid + 1;
            }
            else r = mid - 1;
        }
        smin(lis[ans], v[i]);
        smax(sol, ans);
    }
    cout << sol << en;
    return 0;
}

Compilation message (stderr)

Arcade.cpp: In function 'int main()':
Arcade.cpp:34:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |             int mid = l + r >> 1;
      |                       ~~^~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 14 / 14
• Subtask 6: 20 / 20
• Subtask 7: 15 / 15