Submission #367345

#	Time	Username	Problem	Language	Result	Execution time	Memory
367345		piddddgy	Exhibition (JOI19_ho_t2)	C++11	100 / 100	222 ms	4696 KiB

joi2019_ho_t2

#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;
// #define cerr if(false) cerr
#define watch(x) cerr << (#x) << " is " << (x) << endl;
#define endl '\n'
#define ld long double
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define sz(a) (int)(a).size()
#define all(x) (x).begin(), (x).end()
    

auto seed = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 mt(seed);

const int maxn = 100500;
    
int n, m;
pii a[maxn];
int c[maxn];
    
int ans = 0;

// take the x biggest frames
bool go(int upto) {
    priority_queue<int> pq;
    for(int i = 1; i <= upto; i++) {
        pq.push(-c[i]);
    }

    int loc = 0;
    int lst = -1e18;
    for(int i = 1; i <= n; i++) {
        if(pq.empty()) break;

        int x = -pq.top();

        if(a[i].se <= x) {
            loc++;
            pq.pop();
        }
    }

    ans = max(ans, loc);
    return loc == upto;
}
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    cin >> n >> m;
    
    // .fi = value, .se = size
    for(int i = 1; i <= n; i++) {
        cin >> a[i].se >> a[i].fi;
    }
    
    for(int i = 1; i <= m; i++) cin >> c[i];

    sort(a+1, a+n+1);

    sort(c+1, c+m+1);
    reverse(c+1, c+m+1);

    // for(int i = 1; i <= m; i++) go(i);

    int l = 1, r = m;
    while(l <= r) {
        int mid = (l+r)/2;

        if(go(mid)) {
            l = mid+1;
        } else {
            r = mid-1;
        }
    }


    cout << ans << endl;
}
    
/*
    
sort by value then by size
you will always take the biggest frames


    
Did you read the bounds?
Did you make typos?
Are there edge cases (N=1?)
Are array sizes proper?
Integer overflow?
DS reset properly between test cases?
Is using long longs causing TLE?
Are you using floating points?
*/

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'bool go(long long int)':
joi2019_ho_t2.cpp:37:9: warning: unused variable 'lst' [-Wunused-variable]
   37 |     int lst = -1e18;
      |         ^~~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50