Submission #763062

#	Time	Username	Problem	Language	Result	Execution time	Memory
763062		Charizard2021	Furniture (JOI20_furniture)	C++17	100 / 100	1673 ms	19768 KiB

furniture

#include<bits/stdc++.h>
using namespace std;
#define IOS ios::sync_with_stdio(false);; cin.tie(NULL)
void selfMax(long long& a, long long b){
    a = max(a, b);
}
void selfMin(long long& a, long long b){
    a = min(a, b);
}
template<typename T> istream& operator>>(istream& in, vector<T>& a) {for(auto &x : a) in >> x; return in;};
template<typename T1, typename T2> istream& operator>>(istream& in, pair<T1, T2>& x) {return in >> x.first >> x.second;}

template<typename T1, typename T2> ostream& operator<<(ostream& out, const pair<T1, T2>& x) {return out << x.first << ' ' << x.second;}
template<typename T> ostream& operator<<(ostream& out, vector<T>& a) {for(auto &x : a) out << x << ' '; return out;};
template<typename T> ostream& operator<<(ostream& out, vector<vector<T> >& a) {for(auto &x : a) out << x << '\n'; return out;};
template<typename T1, typename T2> ostream& operator<<(ostream& out, vector<pair<T1, T2> >& a) {for(auto &x : a) out << x << '\n'; return out;};

/*

Use DSU dsu(N);

*/
struct DSU {
	vector<long long> e;
	DSU(long long N) { e = vector<long long>(N, -1); }

	// get representive component (uses path compression)
	long long get(long long x) { return e[x] < 0 ? x : e[x] = get(e[x]); }

	bool same_set(long long a, long long b) { return get(a) == get(b); }

	long long size(long long x) { return -e[get(x)]; }

	bool unite(long long x, long long y) {  // union by size
		x = get(x), y = get(y);
		if (x == y) return false;
		if (e[x] > e[y]) swap(x, y);
		e[x] += e[y]; e[y] = x;
		return true;
	}
};
/*

Run with Bit<long long> BIT

*/
template <class T> class BIT {
    private:
        long long size;
        vector<T> bit;
        vector<T> arr;
    public:
        BIT(long long size) : size(size), bit(size + 1), arr(size) {}
        void set(long long ind, long long val) { add(ind, val - arr[ind]); }
        void add(long long ind, long long val) {
            arr[ind] += val;
            ind++;
            for (; ind <= size; ind += ind & -ind) { bit[ind] += val; }
        }
        T pref_sum(long long ind) {
            ind++;
            T total = 0;
            for (; ind > 0; ind -= ind & -ind) { total += bit[ind]; }
            return total;
        }
};
/*

Change Comb for specific Seg tree probs, but run with Seg<long long> Seg;

*/
template<class T> struct Seg {
	const T ID = 1e18; T comb(T a, T b) { return min(a,b); }
	long long n; vector<T> seg;
	void init(long long _n) { n = _n; seg.assign(2*n,ID); }
	void pull(long long p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
	void upd(long long p, T val) {
		seg[p += n] = val; for (p /= 2; p; p /= 2) pull(p); }
	T query(long long l, long long r) {
		T ra = ID, rb = ID;
		for (l += n, r += n+1; l < r; l /= 2, r /= 2) {
			if (l&1) ra = comb(ra,seg[l++]);
			if (r&1) rb = comb(seg[--r],rb);
		}
		return comb(ra,rb);
	}
};
bool inside(long long i, long long j, long long n, long long m){
    return (1 <= i && i <= n && 1 <= j && j <= m);
}
int main(){
    long long n, m;
    cin >> n >> m;
    long long grid[2 + n][2 + m];
    queue<pair<long long, long long> > q;
    long long counter[1 + n + m];
    memset(counter, 0, sizeof(counter));
    for(long long i = 0; i < m + 2; i++){
        grid[0][i] = grid[n + 1][i] = 1;
    }
    for(long long i = 0; i < n + 2; i++){
        grid[i][0] = grid[i][m + 1] = 1;
    }
    for(long long i = 1; i <= n; i++){
        for(long long j = 1; j <= m; j++){
            cin >> grid[i][j];
            if(grid[i][j]){
                q.push(make_pair(i, j));
            }
            else{
                counter[i + j]++;
            }
        }
    }
    while(!q.empty()){
        pair<long long, long long> u = q.front();
        q.pop();
        if(grid[u.first - 1][u.second + 1]){
            if(inside(u.first - 1, u.second, n, m) && !grid[u.first - 1][u.second]){
                grid[u.first - 1][u.second] = 1;
                counter[u.first + u.second - 1]--;
                q.push(make_pair(u.first - 1, u.second));
            }
            if(inside(u.first, u.second + 1, n, m) && !grid[u.first][u.second + 1]){
                grid[u.first][u.second + 1] = 1;
                counter[u.first + u.second + 1]--;
                q.push(make_pair(u.first, u.second + 1));
            }
        }
        if(grid[u.first + 1][u.second - 1]){
            if(inside(u.first + 1, u.second, n, m) && !grid[u.first + 1][u.second]){
                grid[u.first + 1][u.second] = 1;
                counter[u.first + u.second + 1]--;
                q.push(make_pair(u.first + 1, u.second));
            }
            if(inside(u.first, u.second - 1, n, m) && !grid[u.first][u.second - 1]){
                grid[u.first][u.second - 1] = 1;
                counter[u.first + u.second - 1]--;
                q.push(make_pair(u.first, u.second - 1));
            }
        }
    }
    long long queries;
    cin >> queries;
    while(queries--){
        long long a, b;
        cin >> a >> b;
        if(grid[a][b]){
            cout << 1 << "\n";
        }
        else if(counter[a + b] == 1){
            cout << 0 << "\n";
        }
        else{
            cout << 1 << "\n";
            grid[a][b] = 1;
            counter[a + b]--;
            q.push(make_pair(a, b));
            while(!q.empty()){
                pair<long long, long long> u = q.front();
                q.pop();
                if(grid[u.first - 1][u.second + 1]){
                    if(inside(u.first - 1, u.second, n, m) && !grid[u.first - 1][u.second]){
                        grid[u.first - 1][u.second] = 1;
                        counter[u.first + u.second - 1]--;
                        q.push(make_pair(u.first - 1, u.second));
                    }
                    if(inside(u.first, u.second + 1, n, m) && !grid[u.first][u.second + 1]){
                        grid[u.first][u.second + 1] = 1;
                        counter[u.first + u.second + 1]--;
                        q.push(make_pair(u.first, u.second + 1));
                    }
                }
                if(grid[u.first + 1][u.second - 1]){
                    if(inside(u.first + 1, u.second, n, m) && !grid[u.first + 1][u.second]){
                        grid[u.first + 1][u.second] = 1;
                        counter[u.first + u.second + 1]--;
                        q.push(make_pair(u.first + 1, u.second));
                    }
                    if(inside(u.first, u.second - 1, n, m) && !grid[u.first][u.second - 1]){
                        grid[u.first][u.second - 1] = 1;
                        counter[u.first + u.second - 1]--;
                        q.push(make_pair(u.first, u.second - 1));
                    }
                }
            }
        }
    }
}

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