Submission #1105712

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105712		errorgorn	Cutting a Rectangle (BOI24_rectangle)	C++17	100 / 100	1090 ms	242364 KiB

Main

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

#define int long long
#define ll long long
#define ii pair<int,int>
#define iii tuple<int,int,int>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << ": " << x << endl

#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define lb lower_bound
#define ub upper_bound

#define rep(x,start,end) for(int x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n;
ii arr[100005];

bool has[100005];
vector<int> B[5000005];
vector<int> S[5000005];

signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin.exceptions(ios::badbit | ios::failbit);
	
	cin>>n;
	rep(x,1,n+1) cin>>arr[x].fi>>arr[x].se;
	
	int sum=0;
	rep(x,1,n+1) sum+=arr[x].fi*arr[x].se;
	
	vector<int> ans;
	rep(l,1,5000005) if (sum%l==0 && l<=sum/l){
		int a=l,b=sum/l;
		
		rep(x,1,n+1){
			has[x]=false;
			B[arr[x].fi].clear();
			S[arr[x].se].clear();
		}
		
		rep(x,1,n+1){
			B[arr[x].fi].pub(x);
			S[arr[x].se].pub(x);
		}
		
		while (true){
			if (a<b) swap(a,b);
			
			bool h=false;
			
			if (a<5000005) for (auto it:B[a]) if (!has[it]){
				has[it]=h=true;
				b-=arr[it].se;
			}
			
			if (h) continue;
			
			for (auto it:S[b]) if (!has[it]){
				has[it]=h=true;
				a-=arr[it].fi;
			}
			
			if (h) continue;
			
			for (auto it:B[b]) if (!has[it]){
				has[it]=h=true;
				a-=arr[it].se;
			}
			
			if (!h) break;
		}
		
		if (a*b==0) ans.pub(l);
	}
	
	cout<<sz(ans)<<endl;
	for (auto it:ans) cout<<it<<endl;
}

• Subtask 1: 25 / 25
• Subtask 2: 20 / 20
• Subtask 3: 55 / 55