oj.uz

답안 #256952

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
256952 2020-08-03T12:52:08 Z islingr 경주 (Race) (IOI11_race) C++17
100 / 100
 751 ms 38256 KB 
#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (auto i = (a); i < (b); ++i)
#define eb(x...) emplace_back(x)

bool ckmin(auto &a, const auto &b) { return a > b ? a = b, 1 : 0; }

int best_path(int n, int k, int h[][2], int l[]) {
	vector<bool> dead(n);
	vector<int> mn(k + 1), sz(n);
	vector<vector<pair<int, int>>> g(n);

	rep(e, 0, n - 1) {
		g[h[e][0]].eb(h[e][1], l[e]);
		g[h[e][1]].eb(h[e][0], l[e]);
	}

	int ans = n;

	function<int(int)> centroid = [&](int root) {
		function<void(int, int)> init = [&](int u, int p) {
			sz[u] = 1;
			for (auto &[v, d] : g[u])
				if (v != p && !dead[v])
					init(v, u), sz[u] += sz[v];
		};
		init(root, -1);

		function<int(int, int)> dfs = [&](int u, int p) {
			for (auto &[v, d] : g[u])
				if (v != p && !dead[v] && 2 * sz[v] > sz[root])
					return dfs(v, u);
			return u;
		};
		return dfs(root, -1);
	};

	function<void(int)> solve = [&](int s) {
		int root = centroid(s);

		function<void(int, int, int)> clear = [&](int u, int p, int dist) {
			if (dist > k) return;
			mn[dist] = mn[k - dist] = n;
			for (auto &[v, d] : g[u])
				if (v != p && !dead[v])
					clear(v, u, dist + d);
		};
		clear(root, -1, 0);

		vector<pair<int, int>> lazy; int dep = 0;
		function<void(int, int, int)> dfs = [&](int u, int p, int dist) {
			if (dist > k) return;
			ckmin(ans, dep + mn[k - dist]);
			lazy.eb(dist, dep++);
			for (auto &[v, d] : g[u]) {
				if (v == p || dead[v]) continue;
				dfs(v, u, dist + d);
				if (u != root) continue;
				for (auto &[dist, dep] : lazy) ckmin(mn[dist], dep);
				lazy.clear();
			}
			--dep;
		};
		mn[0] = 0; dfs(root, -1, 0);

		dead[root] = true;
		for (auto &[v, d] : g[root]) if (!dead[v]) solve(v);
	};
	solve(0);

	return ans != n ? ans : -1;
}

Compilation message

race.cpp: In lambda function:
race.cpp:24:20: warning: unused variable 'd' [-Wunused-variable]
    for (auto &[v, d] : g[u])
                    ^
race.cpp: In lambda function:
race.cpp:31:20: warning: unused variable 'd' [-Wunused-variable]
    for (auto &[v, d] : g[u])
                    ^
race.cpp: In lambda function:
race.cpp:68:19: warning: unused variable 'd' [-Wunused-variable]
   for (auto &[v, d] : g[root]) if (!dead[v]) solve(v);
                   ^

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 436 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 436 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 3 ms 3968 KB Output is correct
23 Correct 3 ms 3328 KB Output is correct
24 Correct 5 ms 3840 KB Output is correct
25 Correct 4 ms 3712 KB Output is correct
26 Correct 2 ms 1664 KB Output is correct
27 Correct 3 ms 3584 KB Output is correct
28 Correct 2 ms 1152 KB Output is correct
29 Correct 2 ms 1664 KB Output is correct
30 Correct 2 ms 1792 KB Output is correct
31 Correct 3 ms 2944 KB Output is correct
32 Correct 3 ms 3200 KB Output is correct
33 Correct 3 ms 3456 KB Output is correct
34 Correct 3 ms 2688 KB Output is correct
35 Correct 3 ms 3584 KB Output is correct
36 Correct 4 ms 4096 KB Output is correct
37 Correct 3 ms 3584 KB Output is correct
38 Correct 3 ms 2432 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 436 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 201 ms 8056 KB Output is correct
20 Correct 230 ms 8056 KB Output is correct
21 Correct 258 ms 8372 KB Output is correct
22 Correct 241 ms 8696 KB Output is correct
23 Correct 138 ms 8184 KB Output is correct
24 Correct 108 ms 8132 KB Output is correct
25 Correct 213 ms 12408 KB Output is correct
26 Correct 183 ms 17740 KB Output is correct
27 Correct 303 ms 15736 KB Output is correct
28 Correct 418 ms 33264 KB Output is correct
29 Correct 476 ms 31736 KB Output is correct
30 Correct 286 ms 15864 KB Output is correct
31 Correct 290 ms 15868 KB Output is correct
32 Correct 348 ms 15736 KB Output is correct
33 Correct 369 ms 14968 KB Output is correct
34 Correct 291 ms 14584 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 436 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 3 ms 3968 KB Output is correct
23 Correct 3 ms 3328 KB Output is correct
24 Correct 5 ms 3840 KB Output is correct
25 Correct 4 ms 3712 KB Output is correct
26 Correct 2 ms 1664 KB Output is correct
27 Correct 3 ms 3584 KB Output is correct
28 Correct 2 ms 1152 KB Output is correct
29 Correct 2 ms 1664 KB Output is correct
30 Correct 2 ms 1792 KB Output is correct
31 Correct 3 ms 2944 KB Output is correct
32 Correct 3 ms 3200 KB Output is correct
33 Correct 3 ms 3456 KB Output is correct
34 Correct 3 ms 2688 KB Output is correct
35 Correct 3 ms 3584 KB Output is correct
36 Correct 4 ms 4096 KB Output is correct
37 Correct 3 ms 3584 KB Output is correct
38 Correct 3 ms 2432 KB Output is correct
39 Correct 201 ms 8056 KB Output is correct
40 Correct 230 ms 8056 KB Output is correct
41 Correct 258 ms 8372 KB Output is correct
42 Correct 241 ms 8696 KB Output is correct
43 Correct 138 ms 8184 KB Output is correct
44 Correct 108 ms 8132 KB Output is correct
45 Correct 213 ms 12408 KB Output is correct
46 Correct 183 ms 17740 KB Output is correct
47 Correct 303 ms 15736 KB Output is correct
48 Correct 418 ms 33264 KB Output is correct
49 Correct 476 ms 31736 KB Output is correct
50 Correct 286 ms 15864 KB Output is correct
51 Correct 290 ms 15868 KB Output is correct
52 Correct 348 ms 15736 KB Output is correct
53 Correct 369 ms 14968 KB Output is correct
54 Correct 291 ms 14584 KB Output is correct
55 Correct 14 ms 1152 KB Output is correct
56 Correct 15 ms 1152 KB Output is correct
57 Correct 152 ms 8824 KB Output is correct
58 Correct 67 ms 8172 KB Output is correct
59 Correct 182 ms 18516 KB Output is correct
60 Correct 751 ms 38256 KB Output is correct
61 Correct 296 ms 15736 KB Output is correct
62 Correct 319 ms 19584 KB Output is correct
63 Correct 473 ms 19832 KB Output is correct
64 Correct 720 ms 19316 KB Output is correct
65 Correct 409 ms 15736 KB Output is correct
66 Correct 620 ms 32760 KB Output is correct
67 Correct 285 ms 19944 KB Output is correct
68 Correct 450 ms 19708 KB Output is correct
69 Correct 482 ms 19832 KB Output is correct
70 Correct 401 ms 19192 KB Output is correct