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Submission #1043637

# Submission time Handle Problem Language Result Execution time Memory
1043637 2024-08-04T12:43:29 Z javotaz LOSTIKS (INOI20_lostiks) C++17
59 / 100
 2000 ms 136788 KB 
// In the Name of Allah
 
#include<bits/stdc++.h>
using namespace std;
 
#pragma GCC optimize("Ofast,unroll-loops,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4.1,avx,avx2,sse4.2,popcnt,tune=native")
 
typedef long long ll;
 
#define F first
#define S second
#define pii pair<int, int>
#define pb push_back
#define pp pop_back
#define all(x) x.begin(), x.end()
 
const int N = 1e6 + 12, M = 20, inf = 1e9 + 7;
vector<pii> g[N];
int n, s, t, par[N], dp[(1 << M) + 4][M], p[N], kd[N], pd[N], e[N], l[N], r[N], dis[2 * M + 2][2 * M + 2];
pii f[2 * M + 2][2 * M + 2];
bool mrk[N];
vector<int> v, d;
 
void ip() {
	cin >> n >> s >> t;
	for (int i = 1; i < n; i++) {
		int u, v, w;
		cin >> u >> v >> w;
		g[u].pb({v, w});
		g[v].pb({u, w});
	}
}
 
void dfs(int u) {
	for (auto i: g[u])
		if (i.F != par[u]) { 
			par[i.F] = u;
			e[i.F] = e[u] + 1;
			if (i.S) {
				pd[i.F] = d.size(), d.pb(i.F), kd[i.F] = i.S;
				v.pb(u), v.pb(i.S);
			}
			dfs(i.F);
		}
}
 
void dfs2(int u, int rt, int h = 0, int mask = 0, int par = -1) {
	if (mrk[u])
		f[rt][p[u]] = {h, mask}, dis[rt][p[u]] = h;
	for (auto i: g[u])
		if (i.F != par)
			dfs2(i.F, rt, h + 1, (i.S? (mask | (1 << pd[(e[u] < e[i.F])? i.F : u])) : mask), u);
}
 
void solve() {
	par[s] = s;
	dfs(s);
	v.pb(s), v.pb(t);
	sort(all(v));
	v.resize(unique(all(v)) - v.begin());
	for (int i = 0; i < v.size(); i++) 
		p[v[i]] = i, mrk[v[i]] = true;
	for (int i = 0; i < v.size(); i++)
		dfs2(v[i], i);
	memset(dp, 63, sizeof dp);
}

bool check(int v, int u, int x) {
	return ((f[l[v]][r[u]].S | x) == x);
}

int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	ip(), solve();
	int c = d.size();
	int ans = inf;
	for (int i = 0; i < c; i++)
		l[i] = p[par[d[i]]], r[i] = p[kd[d[i]]];
	for (int mask = 1; mask < (1 << c); ++mask) {
		bool flag = false;
		for (int i = 0; i < c; ++i)
			if (((mask >> i) & 1) && (f[r[i]][l[i]].S | (mask ^ (1 << i))) != (mask ^ (1 << i)))
				flag = true;
		if (flag)
			continue;
		for (int i = 0; i < c; ++i) 
			if ((mask >> i) & 1) {
				int x = (mask ^ (1 << i));
				if (!x) {
					if ((f[p[s]][r[i]].S | x) == x)
						dp[mask][i] = f[p[s]][r[i]].F + f[r[i]][l[i]].F;
				}
				else {
					int u = __builtin_ctz(x), y = inf;
					auto &s = dis[r[i]];
					auto &ss = dp[x];
					if (check(u, i, x)) {
						int z = x;
						char j;
						for (; z; z ^= z & -z)
							y = min(y, s[l[__builtin_ctz(z)]] + ss[__builtin_ctz(z)]);
					}
					dp[mask][i] = y + s[l[i]];
				}
				if ((f[l[i]][p[t]].S | mask) == mask)
					ans = min(ans, dp[mask][i] + f[l[i]][p[t]].F);
			}
	}
	if (f[p[s]][p[t]].S == 0)
		ans = f[p[s]][p[t]].F;
	cout << ((ans >= inf)? -1 : ans) << '\n';
	return 0;
}

Compilation message

Main.cpp: In function 'void solve()':
Main.cpp:62:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |  for (int i = 0; i < v.size(); i++)
      |                  ~~^~~~~~~~~~
Main.cpp:64:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |  for (int i = 0; i < v.size(); i++)
      |                  ~~^~~~~~~~~~
Main.cpp: In function 'int32_t main()':
Main.cpp:100:12: warning: unused variable 'j' [-Wunused-variable]
  100 |       char j;
      |            ^

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 119640 KB Output is correct
2 Correct 13 ms 119640 KB Output is correct
3 Correct 65 ms 128360 KB Output is correct
4 Correct 65 ms 128336 KB Output is correct
5 Correct 66 ms 128340 KB Output is correct
6 Correct 65 ms 128336 KB Output is correct
7 Correct 70 ms 128340 KB Output is correct
8 Correct 66 ms 128300 KB Output is correct
9 Correct 68 ms 128592 KB Output is correct
10 Correct 66 ms 128232 KB Output is correct
11 Correct 65 ms 128336 KB Output is correct
12 Correct 73 ms 130388 KB Output is correct
13 Correct 66 ms 131408 KB Output is correct
14 Correct 64 ms 130128 KB Output is correct
15 Correct 64 ms 130388 KB Output is correct
16 Correct 71 ms 131664 KB Output is correct
17 Correct 69 ms 131408 KB Output is correct
18 Correct 66 ms 131924 KB Output is correct
19 Correct 70 ms 136608 KB Output is correct
20 Correct 69 ms 136788 KB Output is correct
21 Correct 68 ms 136788 KB Output is correct
22 Correct 15 ms 119900 KB Output is correct
23 Correct 15 ms 119748 KB Output is correct
24 Correct 14 ms 119788 KB Output is correct
25 Correct 13 ms 119900 KB Output is correct
26 Correct 15 ms 119868 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 119644 KB Output is correct
2 Correct 13 ms 119808 KB Output is correct
3 Correct 14 ms 119900 KB Output is correct
4 Correct 12 ms 119900 KB Output is correct
5 Correct 40 ms 120208 KB Output is correct
6 Correct 41 ms 120156 KB Output is correct
7 Correct 47 ms 120152 KB Output is correct
8 Correct 47 ms 120156 KB Output is correct
9 Correct 38 ms 120108 KB Output is correct
10 Correct 42 ms 120156 KB Output is correct
11 Correct 41 ms 120056 KB Output is correct
12 Correct 39 ms 120152 KB Output is correct
13 Correct 41 ms 120152 KB Output is correct
14 Correct 40 ms 120152 KB Output is correct
15 Correct 40 ms 120156 KB Output is correct
16 Correct 42 ms 120156 KB Output is correct
17 Correct 45 ms 120152 KB Output is correct
18 Correct 42 ms 120152 KB Output is correct
19 Correct 44 ms 120156 KB Output is correct
20 Correct 41 ms 120156 KB Output is correct
21 Correct 39 ms 120412 KB Output is correct
22 Correct 42 ms 120668 KB Output is correct
23 Correct 42 ms 120780 KB Output is correct
24 Correct 42 ms 120664 KB Output is correct
25 Correct 304 ms 119640 KB Output is correct

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 119640 KB Output is correct
2 Correct 13 ms 119640 KB Output is correct
3 Correct 65 ms 128360 KB Output is correct
4 Correct 65 ms 128336 KB Output is correct
5 Correct 66 ms 128340 KB Output is correct
6 Correct 65 ms 128336 KB Output is correct
7 Correct 70 ms 128340 KB Output is correct
8 Correct 66 ms 128300 KB Output is correct
9 Correct 68 ms 128592 KB Output is correct
10 Correct 66 ms 128232 KB Output is correct
11 Correct 65 ms 128336 KB Output is correct
12 Correct 73 ms 130388 KB Output is correct
13 Correct 66 ms 131408 KB Output is correct
14 Correct 64 ms 130128 KB Output is correct
15 Correct 64 ms 130388 KB Output is correct
16 Correct 71 ms 131664 KB Output is correct
17 Correct 69 ms 131408 KB Output is correct
18 Correct 66 ms 131924 KB Output is correct
19 Correct 70 ms 136608 KB Output is correct
20 Correct 69 ms 136788 KB Output is correct
21 Correct 68 ms 136788 KB Output is correct
22 Correct 15 ms 119900 KB Output is correct
23 Correct 15 ms 119748 KB Output is correct
24 Correct 14 ms 119788 KB Output is correct
25 Correct 13 ms 119900 KB Output is correct
26 Correct 15 ms 119868 KB Output is correct
27 Correct 14 ms 119644 KB Output is correct
28 Correct 13 ms 119808 KB Output is correct
29 Correct 14 ms 119900 KB Output is correct
30 Correct 12 ms 119900 KB Output is correct
31 Correct 40 ms 120208 KB Output is correct
32 Correct 41 ms 120156 KB Output is correct
33 Correct 47 ms 120152 KB Output is correct
34 Correct 47 ms 120156 KB Output is correct
35 Correct 38 ms 120108 KB Output is correct
36 Correct 42 ms 120156 KB Output is correct
37 Correct 41 ms 120056 KB Output is correct
38 Correct 39 ms 120152 KB Output is correct
39 Correct 41 ms 120152 KB Output is correct
40 Correct 40 ms 120152 KB Output is correct
41 Correct 40 ms 120156 KB Output is correct
42 Correct 42 ms 120156 KB Output is correct
43 Correct 45 ms 120152 KB Output is correct
44 Correct 42 ms 120152 KB Output is correct
45 Correct 44 ms 120156 KB Output is correct
46 Correct 41 ms 120156 KB Output is correct
47 Correct 39 ms 120412 KB Output is correct
48 Correct 42 ms 120668 KB Output is correct
49 Correct 42 ms 120780 KB Output is correct
50 Correct 42 ms 120664 KB Output is correct
51 Correct 304 ms 119640 KB Output is correct
52 Execution timed out 2050 ms 92248 KB Time limit exceeded
53 Halted 0 ms 0 KB -