Submission #98047

#	Time	Username	Problem	Language	Result	Execution time	Memory
98047		dndhk	Worst Reporter 2 (JOI16_worst_reporter2)	C++14	0 / 100	7 ms	5120 KiB

worst_reporter2

#include <bits/stdc++.h>

using namespace std;
#define F first
#define S second
typedef pair<int, int> pii;

const int MAX_N = 200000;

int N;
deque<pii> dq1, dq2;
vector<int> cnt[MAX_N+1];
int idx[MAX_N+1];
int ans;

set<pii> st;

struct SEG{
	SEG (int sum, int l, int r) : sum(sum), l(l), r(r) {}
	int sum;
	int l, r;
};
vector<SEG> seg;

void init(int idx, int s, int e){
	seg.push_back({0, -1, -1});
	if(s==e)	return;
	seg[idx].l=seg.size(); init(seg[idx].l, s, (s+e)/2);
	seg[idx].r = seg.size(); init(seg[idx].r, (s+e)/2+1, e);
}

void update(int idx, int s, int e, int x, int y){
	seg[idx].sum+=y;
	if(s==e)	return;
	if(x<=(s+e)/2)	update(seg[idx].l, s, (s+e)/2, x, y);
	else	update(seg[idx].r, (s+e)/2+1, e, x, y);
}

int sum(int idx, int s, int e, int x, int y){
	if(x<=s && e<=y)	return seg[idx].sum;
	if(x>e || y<s)	return 0;
	return sum(seg[idx].l, s, (s+e)/2, x, y) + sum(seg[idx].r, (s+e)/2+1, e, x, y);
}

bool able(int x, int k){
	int y = cnt[x].back();
	//cout<<x<<' '<<y<<endl;
	auto it = st.upper_bound({y, 2*N});
	it--;
	pii now = (*it);
	//cout<<now.F<<' '<<now.S<<endl;
	if(now.F<=idx[k] && now.S>=N-k){
		return true;
	}
	if(sum(0, 0, N-1, now.first, N-1)-1>=now.second){
		return true;
	}return false;
}

int main(){
	scanf("%d", &N);
	init(0, 0, N-1);	for(int i=0; i<N; i++)	update(0, 0, N-1, i, 1);
	ans = N;
	for(int i=0; i<N; i++){
		int a, b; scanf("%d%d", &a, &b);
		dq1.push_back({a, b});
	}for(int i=0; i<N; i++){
		int a, b; scanf("%d%d", &a, &b);
		dq2.push_back({a, b});
	}
	for(int i=0; i<N; i++){
		if(i==0)	idx[i] = 0;
		else idx[i] = idx[i-1];
		while(dq1[idx[i]].second > dq2[i].second){
			idx[i]++;
		}
		st.insert({idx[i], N-i});
	}
	for(int i=N-1; i>=0; i--){
		cnt[dq1[i].F].push_back(i);
	}
	for(int i=0; i<N; i++){
		pii now = dq2[i];
		while(!dq1.empty() && dq1.front().S > now.S){
			if(!cnt[dq1.front().F].empty() && (cnt[dq1.front().F].back()==N-dq1.size())){
				cnt[dq1.front().F].pop_back();
			}
			dq1.pop_front(); 
		}
		while(!cnt[now.F].empty()){
			if(able(now.F, i)){
				//cout<<'*'<<cnt[now.F].back()<<endl;
				update(0, 0, N-1, cnt[now.F].back(), -1);
				cnt[now.F].pop_back();
				ans--; break;
			}else	cnt[now.F].pop_back();
		}
	}
	printf("%d", ans);
	return 0;
}

Compilation message (stderr)

worst_reporter2.cpp: In function 'int main()':
worst_reporter2.cpp:85:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(!cnt[dq1.front().F].empty() && (cnt[dq1.front().F].back()==N-dq1.size())){
                                       ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
worst_reporter2.cpp:61:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ~~~~~^~~~~~~~~~
worst_reporter2.cpp:65:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d%d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~
worst_reporter2.cpp:68:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d%d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40