Submission #1023726

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023726		trandangquang	Exhibition (JOI19_ho_t2)	C++14	100 / 100	40 ms	4528 KiB

joi2019_ho_t2

#include <bits/stdc++.h>
 
using namespace std;
 
#define task "test"
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define sz(a) (int)(a).size()
#define all(a) (a).begin(), (a).end()
#define bit(s, i) (((s) >> (i)) & 1)
#define ii pair <int, int>
#define vii vector <ii>
#define vi vector <int>
#define fi first
#define se second
#define ll long long
#define eb emplace_back
#define pb push_back
#define __builtin_popcount __builtin_popcountll
 
void solve();
 
int32_t main() {
    if(fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
	cin.tie(0)->sync_with_stdio(0);
 
    int tc = 1; // cin >> tc;
    FOR(i, 1, tc) {
        solve();
    }
}
 
const int N = 100100;
 
int n, m, frame[N];
ii pic[N];
 
void solve() {
    cin >> n >> m;
    FOR(i, 1, n) cin >> pic[i].fi >> pic[i].se;
    FOR(i, 1, m) cin >> frame[i];
 
    sort(pic+1, pic+1+n, [] (ii x, ii y) {return x.se < y.se || (x.se == y.se && x.fi < y.fi);});
    sort(frame+1, frame+1+m);
 
    int pt1 = n, ans = 0;
    FORD(i, m, 1) {
        while(pic[pt1].fi > frame[i]) --pt1;
        if(pt1>0 && pic[pt1].fi <= frame[i]) {
            ++ans;
            --pt1;
        }
    }
 
    cout << ans;
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'int32_t main()':
joi2019_ho_t2.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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