oj.uz

Submission #1115071

# Submission time Handle Problem Language Result Execution time Memory
1115071 2024-11-20T01:44:22 Z Math4Life2020 Furniture (JOI20_furniture) C++17
100 / 100
 1715 ms 312236 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long; using pii = pair<ll,ll>;

const ll Nm = (1LL<<20); const ll E = 20;
ll st[2*Nm];
ll v2(ll x) {
	return __builtin_ctz(x);
}
ll qry(ll x) { //sum of elements with indices 0,1,2,3,...,x
	if (x<0) {
		return 0;
	}
	ll l = v2(x+1);
	return (st[(x>>l)+(1LL<<(E-l))]+qry(x-(1LL<<l)));
}
void upd(ll a, ll v) {
	ll p = a+Nm;
	while (p>0) {
		st[p]+=v;
		p=p/2;
	}
}

struct hashPii {
	size_t operator()(const pii &p) const { return p.first+ (1000005) * p.second; }
};

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	ll N,M; cin >> N >> M;
	bool C[N][M];
	for (ll n=0;n<N;n++) {
		for (ll m=0;m<M;m++) {
			cin >> C[n][m];
		}
	}
	//represent a point (i,j) as M*i+j
	ll fdeg[N*M]; ll rdeg[N*M];
	vector<ll> fadj[N*M]; vector<ll> radj[N*M];
	vector<pii> vedge;
	for (ll x=0;x<(N*M);x++) {
		fdeg[x]=0;
		rdeg[x]=0;
	}
	unordered_set<pii,hashPii> edges;
	for (ll n=0;n<N;n++) {
		for (ll m=0;m<M;m++) {
			if (m != (M-1)) {
				if (!C[n][m] && !C[n][m+1]) {
					vedge.push_back({M*n+m,M*n+m+1});
					fadj[M*n+m].push_back(M*n+m+1);
					fdeg[M*n+m]++;
					radj[M*n+m+1].push_back(M*n+m);
					rdeg[M*n+m+1]++;
					edges.insert({M*n+m,M*n+m+1});
				}
			}
			if (n != (N-1)) {
				if (!C[n][m] && !C[n+1][m]) {
					vedge.push_back({M*n+m,M*n+m+M});
					fadj[M*n+m].push_back(M*n+m+M);
					fdeg[M*n+m]++;
					radj[M*n+m+M].push_back(M*n+m);
					rdeg[M*n+m+M]++;
					edges.insert({M*n+m,M*n+m+M});
				}
			}
		}
	}
	for (pii p0: vedge) {
		ll a = p0.first; ll b = p0.second;
		upd(a+1,1);
		upd(b,-1);
	}
	fdeg[N*M-1]++; rdeg[0]++;
	//auto square = [](int x) -> long long { return (long long)x * x; };
	queue<ll> vq;
	auto wp = [&](ll x, ll y) -> void {
		if (edges.find({x,y})==edges.end()) {
			return;
		}
		edges.erase(edges.find({x,y}));
		upd(x+1,-1);
		upd(y,1);
		fdeg[x]--;
		rdeg[y]--;
		vq.push(x);
		vq.push(y);
	};
	auto prc = [&]() -> void {
		while (!vq.empty()) {
			ll x = vq.front(); vq.pop();
			if (x==(N*M-1) || (x==0)) {
				continue;
			}
			ll a = x/M; ll b = x%M;
			if (rdeg[x]==0 && fdeg[x]!=0) {
				if (a!=(N-1)) {
					wp(x,x+M);
				}
				if (b != (M-1)) {
					wp(x,x+1);
				}
			}
			if (rdeg[x]!=0 && fdeg[x]==0) {
				// wp(x-M,x);
				// wp(x-1,x);
				if (a != 0) {
					wp(x-M,x);
				}
				if (b != 0) {
					wp(x-1,x);
				}
			}
			if (rdeg[x]==0 && fdeg[x]==0) {
				if (a!=(N-1)) {
					wp(x,x+M);
				}
				if (b != (M-1)) {
					wp(x,x+1);
				}
				if (a != 0) {
					wp(x-M,x);
				}
				if (b != 0) {
					wp(x-1,x);
				}
			}
		}
	};
	for (ll p=0;p<(N*M);p++) {
		vq.push(p);
	}
	prc();
	ll Q; cin >> Q;
	for (ll q=0;q<Q;q++) {
		ll x,y; cin >> x >> y; x--; y--;
		ll p = x*M+y;
		if (qry(p)==0) {
			cout << "0\n";
		} else {
			rdeg[p]=0; fdeg[p]=0;
			vq.push(p);
			prc();
			cout << "1\n";
		}
	}
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8140 KB Output is correct
2 Correct 4 ms 7504 KB Output is correct
3 Correct 7 ms 8664 KB Output is correct
4 Correct 8 ms 9076 KB Output is correct
5 Correct 8 ms 9076 KB Output is correct
6 Correct 10 ms 9416 KB Output is correct
7 Correct 10 ms 9416 KB Output is correct
8 Correct 10 ms 9416 KB Output is correct
9 Correct 10 ms 9584 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8140 KB Output is correct
2 Correct 4 ms 7504 KB Output is correct
3 Correct 7 ms 8664 KB Output is correct
4 Correct 8 ms 9076 KB Output is correct
5 Correct 8 ms 9076 KB Output is correct
6 Correct 10 ms 9416 KB Output is correct
7 Correct 10 ms 9416 KB Output is correct
8 Correct 10 ms 9416 KB Output is correct
9 Correct 10 ms 9584 KB Output is correct
10 Correct 56 ms 25652 KB Output is correct
11 Correct 10 ms 9160 KB Output is correct
12 Correct 1593 ms 272160 KB Output is correct
13 Correct 758 ms 224160 KB Output is correct
14 Correct 1701 ms 265232 KB Output is correct
15 Correct 1619 ms 267280 KB Output is correct
16 Correct 1254 ms 287660 KB Output is correct
17 Correct 1390 ms 302196 KB Output is correct
18 Correct 1528 ms 296180 KB Output is correct
19 Correct 1563 ms 312236 KB Output is correct
20 Correct 1575 ms 312156 KB Output is correct
21 Correct 1715 ms 311892 KB Output is correct