Submission #1273736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1273736		nthvn	Exhibition (JOI19_ho_t2)	C++20	0 / 100	1 ms	576 KiB

joi2019_ho_t2

#include "bits/stdc++.h"
using namespace std;

#define LOG(n) (63 - __builtin_clzll((n)))
#define fi first
#define se second
#define pii pair<int,int> 
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define pb push_back
#define ll long long
const int inf = 1e9+7;

const int N = 1e5+5;
int n,m,tot;
pii a[N];

bool cmp(pii &a, pii &b){
	return a.se < b.se;
}

void sort_array(){
	sort(a+1,a+tot+1);
	int last = 0;
	for(int i=1;i<=tot;i++){
		if(a[i].se==inf){
			if(last+1<i) sort(a+last+1,a+i,cmp);
			last = i;
		}
	}
	// for(int i=1;i<=tot;i++) {
		// cerr<<a[i].fi<<" ";
		// if(a[i].se!=inf) cerr<<a[i].se;
		// cerr<<"\n";
	// }
}

signed main(){
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);
	if(fopen("TASK.INP", "r")){
		freopen("TASK.INP", "r", stdin);
		freopen("TASK.OUT", "w", stdout);
	}
	cin>>n>>m;
	for(int i=1;i<=n;i++) {
		int x,y; cin>>x>>y;
		a[++tot] = {x,y};
	}
	for(int i=1;i<=m;i++) cin>>a[++tot].fi, a[tot].se = inf;
	
	sort_array();
	// cerr<<'\n';
	multiset<int> st;
	int sz =0;
	for(int i=tot;i>=1;i--){
		if(a[i].se==inf) sz++;
		else{
			auto it = st.lower_bound(a[i].se);
			if(it!=st.begin()) {
				advance(it,-1);
				st.erase(it);
				st.insert(a[i].se);
			}
			else{
				if(sz(st)<sz) st.insert(a[i].se);
			}
		}
		// cerr<<i<<" "<<sz(st)<<"\n";
		
	}
	// cerr<<sz;
	cout<<sz(st);
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'int main()':
joi2019_ho_t2.cpp:42:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |                 freopen("TASK.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:43:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |                 freopen("TASK.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50