oj.uz

답안 #18526

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
18526 2016-02-08T04:19:54 Z choyi0521 물병 (JOI14_bottle) C++14
30 / 100
 1023 ms 83832 KB 
#include<stdio.h>
#include<queue>
#include<vector>
#include<algorithm>
using namespace std;
const int MAX_P = 200000, LGP=17;
const int fx[] = { 1,0,-1,0 }, fy[] = { 0,1,0,-1 };
int h, w,p,q, ck[2001][2001],dist[2001][2001];
char map[2001][2002];
vector<pair<int, int>> adj[MAX_P+1];
struct uf {
	int par[MAX_P+1],rnk[MAX_P+1];
	uf(){
		for (int i = 1; i <= MAX_P; i++)
			par[i] = i, rnk[i] = 0;
	}
	int find(int x) {
		if (x == par[x]) return x;
		return par[x] = find(par[x]);
	}
	void unite(int x, int y) {
		if (rnk[x] > rnk[y]) par[y] = x;
		else {
			par[x] = y;
			if (rnk[x] == rnk[y]) rnk[y]++;
		}
	}
}st;
struct qst {
	int x, y,idx,dis;
};
bool dck[MAX_P + 1];
int dp[MAX_P + 1][LGP + 1],maxi[MAX_P+1][LGP+1],lv[MAX_P+1];
void dfs(int h) {
	dck[h] = true;
	for (auto t : adj[h]) {
		if (dck[t.first]) continue;
		lv[t.first] = lv[h] + 1;
		dp[t.first][0] = h;
		maxi[t.first][0] = t.second;
		for (int i = 1; i <= LGP; i++) {
			dp[t.first][i] = dp[dp[t.first][i - 1]][i - 1];
			maxi[t.first][i] = max(maxi[dp[t.first][i - 1]][i - 1], maxi[t.first][i - 1]);
		}
		dfs(t.first);
	}
}
int lca(int x, int y) {
	if (lv[x] < lv[y]) swap(x, y);
	int res = 0;
	for (int i = LGP; i >= 0; i--)
		if (lv[x] - lv[y] >= 1 << i) res = max(res, maxi[x][i]),x = dp[x][i];
	if (x == y) return res;
	for (int i = LGP; i >= 0; i--) {
		if (dp[x][i] != dp[y][i]) {
			res = max({ res,maxi[x][i],maxi[y][i] });
			x = dp[x][i];
			y = dp[y][i];
		}
	}
	return max({ res,maxi[x][0],maxi[y][0] });
}
int main() {
	scanf("%d %d %d %d", &h, &w, &p, &q);
	for (int i = 1; i <= h; i++) scanf("%s", map[i] + 1);
	queue<qst> que;
	for (int i = 1; i <= p; i++) {
		int x, y;
		scanf("%d %d", &x, &y);
		que.push({ x,y,i,0 });
	}
	while (!que.empty()) {
		qst he = que.front();
		que.pop();
		if (he.x<1 || he.y<1 || he.x>h || he.y>w || map[he.x][he.y]=='#') continue;
		if (ck[he.x][he.y]) {
			int a = st.find(ck[he.x][he.y]),b=st.find(he.idx),
				d=dist[he.x][he.y]+he.dis-1;
			if (a != b) {
				adj[ck[he.x][he.y]].push_back({ he.idx,d });
				adj[he.idx].push_back({ ck[he.x][he.y],d });
				st.unite(a, b);
			}
			continue;
		}
		ck[he.x][he.y] = he.idx;
		dist[he.x][he.y] = he.dis;
		for (int i = 0; i < 4; i++)
			que.push({ he.x + fx[i],he.y + fy[i],he.idx,he.dis + 1 });
	}
	dfs(1);
	for (int i = 0; i < q; i++) {
		int x, y;
		scanf("%d %d", &x, &y);
		if (st.find(x) != st.find(y)) puts("-1");
		else printf("%d\n", lca(x, y));
	}
	return 0;
}

Subtask #1
0.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 72124 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 72652 KB Output is correct
2 Correct 62 ms 74012 KB Output is correct
3 Correct 558 ms 74664 KB Output is correct
4 Correct 753 ms 78652 KB Output is correct
5 Correct 830 ms 80840 KB Output is correct
6 Correct 547 ms 74656 KB Output is correct
7 Correct 753 ms 78388 KB Output is correct
8 Correct 864 ms 80840 KB Output is correct
9 Correct 1023 ms 83832 KB Output is correct
10 Correct 664 ms 74232 KB Output is correct
11 Correct 697 ms 76132 KB Output is correct
12 Correct 250 ms 75780 KB Output is correct
13 Correct 335 ms 73176 KB Output is correct
14 Correct 271 ms 75776 KB Output is correct
15 Correct 350 ms 73288 KB Output is correct

Subtask #3
0.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 26 ms 72652 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 660 ms 76004 KB Output isn't correct
2 Halted 0 ms 0 KB -