Submission #736705

#	Time	Username	Problem	Language	Result	Execution time	Memory
736705		bobthebuilder	Rectangles (IOI19_rect)	C++17	10 / 100	6 ms	596 KiB

rect

#include "rect.h"
#include<bits/stdc++.h>
using namespace std;
#define sz(x) (int)x.size()
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define pb push_back
#define lowb(x) (x&(-x))
#define ALL(x) x.begin(),x.end()
#define pii pair<int,int>
#define f first
#define s second
#define SORT_UNIQUE(x) sort(ALL(x)),x.erase(unique(ALL(x)),x.end())
const int maxn=3e3+5;
#define ll long long
pii rng[maxn];
int par[maxn];
bool ded[maxn];
int find(int u){
	if(par[u]==u) return u;
	return par[u]=find(par[u]);
}
void merge(int a,int b){
	a=find(a),b=find(b);
	if(a==b) return;
	rng[b]={min(rng[a].f,rng[b].f),max(rng[a].s,rng[b].s)};
	par[a]=b;
}
long long count_rectangles(std::vector<std::vector<int> > a) {
	int n=sz(a),m=sz(a[0]);
	map<pii,vector<int>> mp;
	REP1(i,n-2){
		vector<pii> v;
		REP(j,m) rng[j]={j,j},par[j]=j;
		REP(j,m){
			if(a[i-1][j]<=a[i][j] or a[i+1][j]<=a[i][j]){
				ded[j]=1;
			}
			v.pb({a[i][j],j});
		}
		sort(ALL(v));
		vector<pii> vv;
		for(int j=0;j<sz(v);){
			int p=j;
			vector<int> ps;
			while(j<sz(v) and v[p].f==v[j].f){
				int z=v[j].s;
				if(z and a[i][z-1]<=a[i][z]) merge(z-1,z);
				if(z+1<m and a[i][z+1]<=a[i][z]) merge(z,z+1);
				ps.pb(z);
				++j;
			}
			for(int x:ps){
				auto z=rng[find(x)];
				if(z.f and z.s!=m-1) {
					bool ok=1;
					for(int j=z.f;j<=z.s;j++){
						if(ded[j]){
							ok=0;
							break;
						}
						assert(a[i][j]<a[i][z.f-1] and a[i][j]<a[i][z.s+1]);
					}
					if(ok) vv.pb(z);
				}
			}
		}
		SORT_UNIQUE(vv);
		for(auto x:vv){

			mp[x].pb(i);
		}
		return sz(vv);
	}
	return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 10 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28