Submission #1040793

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040793		khanhtb	Exhibition (JOI19_ho_t2)	C++17	100 / 100	35 ms	4692 KiB

joi2019_ho_t2

#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const ll mod = 998244353; 
const ll inf = 1e18;
const ll blocksz = 320;
const ll N = 1e5+8;
pair<int,int> a[N];
int n,m,c[N];
void solve(){
    cin >> n >> m;
    for(int i = 1; i <= n; i++) cin >> a[i].fi >> a[i].se;
    for(int i = 1; i <= m; i++) cin >> c[i];
    sort(a+1,a+n+1,[&](pair<int,int> a, pair<int,int> b){
        return a.se < b.se || (a.se == b.se && a.fi < b.fi);
    });
    sort(c+1,c+m+1);
    int j = n;
    ll ans = 0;
    for(int i = m; i >= 1; i--){
        while(j >= 1 && a[j].fi > c[i]) j--;
        if(j > 0) ans++;
        j--;
    }
    cout << ans;
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen("test.inp", "r")) {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }   
    ll T = 1;
    // cin >> T;
    for (ll i = 1; i <= T; i++) {
        solve();
        cout << '\n';
    }
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'int main()':
joi2019_ho_t2.cpp:44:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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