Submission #441426

#	Time	Username	Problem	Language	Result	Execution time	Memory
441426		zaneyu	Furniture (JOI20_furniture)	C++14	100 / 100	345 ms	18900 KiB

furniture

/*input
2 3
0 0 1
0 0 0
3
2 2
2 1
1 2
*/
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_set;
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast,unroll-loops")
//order_of_key #of elements less than x
// find_by_order kth element
using ll=long long;
using ld=long double;
using pii=pair<int,int>;
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()),c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
const ll INF64=1e18+1;
const int INF=0x3f3f3f3f;
int MOD=1e9+7;
const ld PI=acos(-1);
const ld eps=1e-3;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
inline ll mult(ll a,ll b){
    if(a>=MOD) a%=MOD;
    if(b>=MOD) b%=MOD;
    return (a*b)%MOD;
}
inline ll mypow(ll a,ll b){
    if(b<=0) return 1;
    ll res=1LL;
    while(b){
        if(b&1) res=mult(res,a);
        a=mult(a,a);
        b>>=1;
    }
    return res;
}
const int maxn=1e3+5;
const int maxlg=__lg(maxn)+2;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
bool vs[maxn][maxn],ve[maxn][maxn];
bool ok[maxn][maxn];
int cnt[2*maxn];
int arr[maxn][maxn];
int n,m;
bool isin(int x,int y){
    if(x<1 or x>n or y<1 or y>m) return false;
    return true;
}
bool bad(int x,int y){
    if(x==1 and y==1) return false;
    if(x==n and y==m) return false;
    if(!ok[x-1][y] and !ok[x][y-1]) return true;
    if(!ok[x][y+1] and !ok[x+1][y]) return true;
    return false;
}
int32_t main(){
    ios::sync_with_stdio(false),cin.tie(0);
    cin>>n>>m;
    REP1(i,n) REP1(j,m){
        cin>>arr[i][j];
    }
    queue<pii> q;
    q.push({1,1});
    vs[1][1]=1;
    while(!q.empty()){
        pii z=q.front();
        q.pop();
        if(z.f<n and !arr[z.f+1][z.s] and !vs[z.f+1][z.s]) vs[z.f+1][z.s]=1,q.push({z.f+1,z.s});
        if(z.s<m and !arr[z.f][z.s+1] and !vs[z.f][z.s+1]) vs[z.f][z.s+1]=1,q.push({z.f,z.s+1});
    }
    q.push({n,m});
    ve[n][m]=1;
    while(!q.empty()){
        pii z=q.front();
        q.pop();
        if(z.f>1 and !arr[z.f-1][z.s] and !ve[z.f-1][z.s]) ve[z.f-1][z.s]=1,q.push({z.f-1,z.s});
        if(z.s>1 and !arr[z.f][z.s-1] and !ve[z.f][z.s-1]) ve[z.f][z.s-1]=1,q.push({z.f,z.s-1});
    }
    REP1(i,n){
        REP1(j,m){
            if(vs[i][j] and ve[i][j]) ok[i][j]=1,cnt[i+j]++;
        }
    }
    int qq;
    cin>>qq;
    while(qq--){
        int x,y;
        cin>>x>>y;
        if(!ok[x][y]) cout<<"1\n";
        else{
            if(cnt[x+y]>1){
                ok[x][y]=0;
                cnt[x+y]--;
                cout<<"1\n";   
                q.push({x,y});
                while(!q.empty()){
                    pii z=q.front();
                    q.pop();
                    REP(k,4){
                        int nx=z.f+dx[k],ny=z.s+dy[k];
                        if(isin(nx,ny) and bad(nx,ny) and ok[nx][ny]){
                            ok[nx][ny]=0;
                            cnt[nx+ny]--;
                            q.push({nx,ny});
                        }
                    }
                }
                
            }
            else cout<<"0\n";
        }
        //REP1(i,n) REP1(j,m) cout<<ok[i][j]<<' ';
    }
}  

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