oj.uz

Submission #362156

# Submission time Handle Problem Language Result Execution time Memory
362156 2021-02-01T21:17:25 Z doowey Furniture (JOI20_furniture) C++14
100 / 100
 419 ms 8684 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 low_y[N];
int low_x[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];
        }
    }
    for(int i = 1; i <= n; i ++ ){
        low_x[i] = 1;
    }
    for(int i = 1; i <= m; i ++ ){
        low_y[i] = 1;
    }
    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{
            while(low_y[yi] < xi){
                if(!is_up[low_y[yi]][yi] || !is_down[low_y[yi]][yi+1]) low_y[yi] ++ ;
                else break;
            }
            while(low_x[xi] < yi){
                if(!is_up[xi][low_x[xi]] || !is_down[xi+1][low_x[xi]]) low_x[xi] ++ ;
                else break;
            }
            if(low_y[yi] < xi || low_x[xi] < yi) keep = true;
            else keep = false;
            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 5 ms 1004 KB Output is correct
5 Correct 4 ms 1132 KB Output is correct
6 Correct 4 ms 1004 KB Output is correct
7 Correct 4 ms 1004 KB Output is correct
8 Correct 4 ms 1004 KB Output is correct
9 Correct 4 ms 1004 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 5 ms 1004 KB Output is correct
5 Correct 4 ms 1132 KB Output is correct
6 Correct 4 ms 1004 KB Output is correct
7 Correct 4 ms 1004 KB Output is correct
8 Correct 4 ms 1004 KB Output is correct
9 Correct 4 ms 1004 KB Output is correct
10 Correct 12 ms 1004 KB Output is correct
11 Correct 3 ms 748 KB Output is correct
12 Correct 225 ms 7404 KB Output is correct
13 Correct 70 ms 6508 KB Output is correct
14 Correct 354 ms 7936 KB Output is correct
15 Correct 360 ms 7932 KB Output is correct
16 Correct 364 ms 8172 KB Output is correct
17 Correct 406 ms 8576 KB Output is correct
18 Correct 361 ms 8300 KB Output is correct
19 Correct 396 ms 8684 KB Output is correct
20 Correct 325 ms 8684 KB Output is correct
21 Correct 419 ms 8684 KB Output is correct