Submission #899181

#	Time	Username	Problem	Language	Result	Execution time	Memory
899181		GrindMachine	Arcade (NOI20_arcade)	C++17	100 / 100	141 ms	24660 KiB

Arcade

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

void solve(int test_case)
{
    ll n,m; cin >> n >> m;
    vector<pll> a(m+5);
    rep1(i,m) cin >> a[i].ff;
    rep1(i,m) cin >> a[i].ss;

    vector<pll> b(m+5);
    rep1(i,m){
        auto [t,p] = a[i];
        b[i] = {p-t,p+t};
    }

    auto cmp = [&](pll p1, pll p2){
        if(p1.ff != p2.ff) return p1.ff < p2.ff;
        return p1.ss > p2.ss;
    };

    sort(b.begin()+1,b.begin()+m+1,cmp);

    vector<ll> lis;

    rep1(i,m){
        ll x = b[i].ss;
        auto it = lower_bound(all(lis),x);
        if(it == lis.end()) lis.pb(x);
        else *it = x;
    }

    ll ans = sz(lis);
    cout << ans << endl;    
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• 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