oj.uz

Submission #362155

# Submission time Handle Problem Language Result Execution time Memory
362155 2021-02-01T21:05:37 Z doowey Furniture (JOI20_furniture) C++14
100 / 100
 681 ms 18012 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = 1010;
int C[N][N];
bool is_up[N][N];
bool is_down[N][N];

int main(){
    fastIO;
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= n; i ++ ){
        for(int j = 1; j <= m ; j ++ ){
            cin >> C[i][j];
        }
    }
    is_up[1][1]=true;
    is_down[n][m]=true;
    for(int i = 1; i <= n; i ++ ){
        for(int j = 1; j <= m ; j ++ ){
            if(i == 1 && j == 1) continue;
            if(C[i][j]==1) continue;
            is_up[i][j] = (is_up[i][j-1]|is_up[i-1][j]);
        }
    }
    for(int i = n; i >= 1; i -- ){
        for(int j = m ; j >= 1; j -- ){
            if(i==n && j == m) continue;
            if(C[i][j]==1) continue;
            is_down[i][j] = (is_down[i+1][j]|is_down[i][j+1]);
        }
    }
    int q;
    cin >> q;
    int xi, yi;
    bool keep;
    int ci, cj;
    for(int qr = 1; qr <= q; qr ++ ){
        cin >> xi >> yi;
        if(!is_up[xi][yi] || !is_down[xi][yi]){
            C[xi][yi]=1;
            cout << 1 << "\n";
        }
        else{
            keep = false;
            for(int i = xi - 1; i >= 1; i -- ){
                if(is_up[i][yi] && is_down[i][yi+1]){
                    keep = true;
                }
            }
            for(int i = yi - 1; i >= 1; i -- ){
                if(is_up[xi][i] && is_down[xi+1][i]){
                    keep = true;
                }
            }
            if(keep == true){
                C[xi][yi]=0;
                is_up[xi][yi]=false;
                is_down[xi][yi]=false;
                queue<pii> qq;
                qq.push(mp(xi,yi));
                while(!qq.empty()){
                    ci = qq.front().fi;
                    cj = qq.front().se;
                    qq.pop();
                    if(is_up[ci+1][cj] && !is_up[ci+1][cj-1]){
                        is_up[ci+1][cj]=false;
                        qq.push(mp(ci+1,cj));
                    }
                    if(is_up[ci][cj+1] && !is_up[ci-1][cj+1]){
                        is_up[ci][cj+1]=false;
                        qq.push(mp(ci,cj+1));
                    }
                }
                qq.push(mp(xi,yi));
                while(!qq.empty()){
                    ci = qq.front().fi;
                    cj = qq.front().se;
                    qq.pop();
                    if(is_down[ci-1][cj] && !is_down[ci-1][cj+1]){
                        is_down[ci-1][cj]=false;
                        qq.push(mp(ci-1,cj));
                    }
                    if(is_down[ci][cj-1] && !is_down[ci+1][cj-1]){
                        is_down[ci][cj-1]=false;
                        qq.push(mp(ci,cj-1));
                    }
                }
                cout << "1\n";
            }
            else{
                cout << "0\n";
            }
        }
    }
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 748 KB Output is correct
2 Correct 2 ms 1004 KB Output is correct
3 Correct 3 ms 1004 KB Output is correct
4 Correct 4 ms 1004 KB Output is correct
5 Correct 4 ms 1004 KB Output is correct
6 Correct 5 ms 1132 KB Output is correct
7 Correct 5 ms 1132 KB Output is correct
8 Correct 4 ms 1132 KB Output is correct
9 Correct 4 ms 1132 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 748 KB Output is correct
2 Correct 2 ms 1004 KB Output is correct
3 Correct 3 ms 1004 KB Output is correct
4 Correct 4 ms 1004 KB Output is correct
5 Correct 4 ms 1004 KB Output is correct
6 Correct 5 ms 1132 KB Output is correct
7 Correct 5 ms 1132 KB Output is correct
8 Correct 4 ms 1132 KB Output is correct
9 Correct 4 ms 1132 KB Output is correct
10 Correct 11 ms 1004 KB Output is correct
11 Correct 3 ms 748 KB Output is correct
12 Correct 493 ms 11116 KB Output is correct
13 Correct 90 ms 7916 KB Output is correct
14 Correct 617 ms 15468 KB Output is correct
15 Correct 681 ms 15724 KB Output is correct
16 Correct 376 ms 16620 KB Output is correct
17 Correct 403 ms 17516 KB Output is correct
18 Correct 603 ms 17192 KB Output is correct
19 Correct 423 ms 18012 KB Output is correct
20 Correct 349 ms 17900 KB Output is correct
21 Correct 419 ms 17900 KB Output is correct