Submission #402529

#	Time	Username	Problem	Language	Result	Execution time	Memory
402529		rqi	Furniture (JOI20_furniture)	C++14	0 / 100	9 ms	844 KiB

furniture

#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> pi;

#define mp make_pair
#define f first
#define s second
#define pb push_back

#define sz(x) (int)(x).size()

const int mx = 1005;
int N, M;
bool C[mx][mx];
bool disap[mx][mx];
pi deg[mx][mx];//leftup, rightdown degree
queue<pi> to_remove;
int maxrow[mx];
int maxcol[mx];

void subDeg(int X, int Y, bool typ){
    if(C[X][Y] || disap[X][Y]) return;
    if(mp(X, Y) == mp(1, 1) || mp(X, Y) == mp(N, M)) return;
    if(typ == 0){
        deg[X][Y].f--;
    }
    else{
        deg[X][Y].s--;
    }
    if(deg[X][Y].f == 0 || deg[X][Y].s == 0){
        to_remove.push(mp(X, Y));
        disap[X][Y] = 1;
    }
}

void removeToRemoves(){
    while(sz(to_remove)){
        pi coor = to_remove.front();
        to_remove.pop();
        disap[coor.f][coor.s] = 0;
        C[coor.f][coor.s] = 1;
        subDeg(coor.f-1, coor.s, 1);
        subDeg(coor.f, coor.s-1, 1);
        subDeg(coor.f+1, coor.s, 0);
        subDeg(coor.f, coor.s+1, 0);
    }
}

void updateMaxes(int X, int Y){
    while(maxrow[X]+1 <= M){
        if(C[X][maxrow[X]+1]){
            maxrow[X]++;
            continue;
        }
        else{
            break;
        }
    }
    while(maxcol[Y]+1 <= N){
        if(C[maxcol[Y]+1][Y]){
            maxcol[Y]++;
            continue;
        }
        else{
            break;
        }
    }
}

int main(){
    cin >> N >> M;
    for(int i = 1; i <= N; i++){
        for(int j = 1; j <= M; j++){
            cin >> C[i][j];
        }
    }
    for(int i = 0; i <= N+1; i++){
        C[i][0] = C[i][M+1] = 1;
    }
    for(int i = 0; i <= M+1; i++){
        C[0][i] = C[N+1][i] = 1;
    }
    for(int i = 1; i <= N; i++){
        for(int j = 1; j <= M; j++){
            if(mp(i, j) == mp(1, 1) || mp(i, j) == mp(N, M)) continue;
            if(C[i][j]) continue;
            deg[i][j].f+=(int)(!C[i-1][j])+(int)(!C[i][j-1]);
            deg[i][j].s+=(int)(!C[i+1][j])+(int)(!C[i][j+1]);
            if(deg[i][j].f == 0 || deg[i][j].s == 0){
                to_remove.push(mp(i, j));
                disap[i][j] = 1;
            }
        }
    }

    int Q;
    cin >> Q;
    for(int i = 1; i <= Q; i++){
        //cout << "QUERY: " << i << "\n";
        int X, Y;
        cin >> X >> Y;
        removeToRemoves();
        updateMaxes(X+1, Y+1);
        // for(int i = 1; i <= N; i++){
        //     for(int j = 1; j <= M; j++){
        //         cout << C[i][j] << " ";
        //     }
        //     cout << "\n";
        // }
        // cout << "\n";
        // for(int i = 1; i <= N; i++){
        //     for(int j = 1; j <= M; j++){
        //         cout << deg[i][j].f << " ";
        //     }
        //     cout << "\n";
        // }
        // cout << "\n";
        // for(int i = 1; i <= N; i++){
        //     for(int j = 1; j <= M; j++){
        //         cout << deg[i][j].s << " ";
        //     }
        //     cout << "\n";
        // }
        // cout << "\n";
        if(C[X][Y] == 0 && maxrow[X+1] >= Y-1 && maxcol[Y+1] >= X-1){
            cout << 0 << "\n";
        }
        else{
            cout << 1 << "\n";
            to_remove.push(mp(X, Y));
            disap[X][Y] = 1;
        }
    }
}

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