Submission #737920

#	Time	Username	Problem	Language	Result	Execution time	Memory
737920		bobthebuilder	Rectangles (IOI19_rect)	C++17	100 / 100	2303 ms	655920 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
vector<int> mp[maxn][maxn],m2[maxn][maxn];
int lok[maxn][maxn],rok[maxn][maxn];
inline vector<pii> get(vector<int> &val){
	int n=sz(val);
	vector<int> v;
	vector<pii> vv;
	REP(i,n){
		while(sz(v) and val[v.back()]<val[i]){
			if(i>v.back()+1) vv.pb({v.back()+1,i-1});
			v.pop_back();
		}
		if(sz(v)){
			if(i>v.back()+1) vv.pb({v.back()+1,i-1});
			if(val[v.back()]==val[i]) v.pop_back();
		}
		v.pb(i);
	}
	return vv;
}
int ans=0;
vector<vector<int>> a;
void calc(int l,int r,int u,int d){
	vector<int> vv;
	for(int i=u-1;i<=d+1;i++){
		vv.pb(a[i][r]);
	}
	auto zz=get(vv);
	for(auto x:zz){
		if(lok[x.f+u-1][x.s+u-1]<=l){
			++ans;
		}
	}
}
long long count_rectangles(std::vector<std::vector<int> > b) {
	a=b;
	int n=sz(a),m=sz(a[0]);
	REP1(i,n-2){
		vector<int> val;
		REP(j,m) val.pb(a[i][j]);
		auto vv=get(val);
		for(auto x:vv){
			mp[x.f][x.s].pb(i);
		}
	}
	REP(i,n) REP(j,n) lok[i][j]=rok[i][j]=-1;
	REP1(i,m-2){
		vector<int> val;
		REP(j,n){
			val.pb(a[j][i]);
		}
		auto vv=get(val);
		for(auto x:vv){
			if(rok[x.f][x.s]<i-1){
				lok[x.f][x.s]=i;
			}
			rok[x.f][x.s]=i;
		}
		REP1(j,i){
			if(!sz(mp[j][i])) continue;
			int pv=mp[j][i][0];
			REP1(z,sz(mp[j][i])-1){
				int x=mp[j][i][z];
				if(x>mp[j][i][z-1]+1){
					calc(j,i,pv,mp[j][i][z-1]);
					pv=x;
				}
			}
			calc(j,i,pv,mp[j][i].back());
		}
	}
	return ans;
}

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