Submission #412129

#	Time	Username	Problem	Language	Result	Execution time	Memory
412129		CSQ31	Furniture (JOI20_furniture)	C++14	0 / 100	4 ms	5196 KiB

furniture

#pragma GCC optimize("Ofast") 
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(1e8)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
ll gcd(ll a,ll b){if(!b)return a;else return gcd(b,a%b);}
const int MAXN = 3e6+5;
vii vis(1111,vector<int>(1111));
int main()
{
	owo
	int n,m;
	cin>>n>>m;
	vector<int>cnt(n+m+1);
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>vis[i][j];	
		}
	}
	vii p1(n+1,vector<int>(m+1)),p2(n+1,vector<int>(m+1)),f(n+1,vector<int>(m+1));
	queue<pii>q;
	q.push({1,1});
	p1[1][1] = 1;
	while(!q.empty()){
		pii v = q.front();
		q.pop();
		if(v.fi+1<=n && !p1[v.fi+1][v.se] && !vis[v.fi+1][v.se]){
			p1[v.fi+1][v.se] = 1;
			q.push({v.fi,v.se});
		}
		if(v.se+1<=m && !p1[v.fi][v.se+1] && !vis[v.fi][v.se+1]){
			p1[v.fi][v.se+1] = 1;
			q.push({v.fi,v.se+1});
		}
	}
	q.push({n,m});
	p2[n][m] = 1;
	while(!q.empty()){
		pii v = q.front();
		q.pop();
		if(v.fi-1 && !p2[v.fi-1][v.se] && !vis[v.fi-1][v.se]){
			p2[v.fi-1][v.se] = 1;
			q.push({v.fi-1,v.se});
		}
		if(v.se-1 && !p2[v.fi][v.se-1] && !vis[v.fi][v.se-1]){
			p2[v.fi][v.se-1] = 1;
			q.push({v.fi,v.se-1});
		}
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			if(!p1[i][j])continue;
			if(j!=m && p2[i][j+1])f[i][j] = 1;
			if(i!=n && p2[i+1][j+1])f[i][j] = 1;
			cnt[i+j]+=f[i][j];
			
		}
	}
	f[n][m] = 1;
	/*
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cout<<f[i][j]<<" ";
		}
		cout<<'\n';
	}*/
	function<void(int,int)> upd = [&](int i,int j){
		f[i][j]=0;
		cnt[i+j]--;
		queue<pii>q;
		q.push({i-1,j});
		q.push({i,j-1});
		while(!q.empty()){
			auto [x,y] = q.front();
			q.pop();
			if(x<0 || x>n || y<0 || y>m || !f[x][y])continue;
			if( (x==n  || !f[x+1][y]) && (y ==m || !f[x][y+1])){
				f[x][y] = 0;
				cnt[x+y]--;
				q.push({x-1,y});
				q.push({x,y-1});
			}
		}	
		q.push({i+1,j});
		q.push({i,j+1});
		while(!q.empty()){
			auto [x,y] = q.front();
			q.pop();
			if(x<0 || x>n || y<0 || y>m || !f[x][y])continue;
			if( (!x || !f[x-1][y]) && (!y || !f[x][y-1])){
				f[x][y] = 0;
				cnt[x+y]--;
				q.push({x+1,y});
				q.push({x,y+1});
			}
		}			
		
	};
	int Q;
	cin>>Q;
	while(Q--){
		int x,y;
		cin>>x>>y;
		if(!f[x][y] || cnt[x+y] > 1){
			cout<<1<<'\n';
			upd(x,y);
		}else cout<<0<<'\n';
	}

}

Compilation message (stderr)

furniture.cpp: In lambda function:
furniture.cpp:91:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   91 |    auto [x,y] = q.front();
      |         ^
furniture.cpp:104:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  104 |    auto [x,y] = q.front();
      |         ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95