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Submission #1043355

# Submission time Handle Problem Language Result Execution time Memory
1043355 2024-08-04T08:44:48 Z javotaz LOSTIKS (INOI20_lostiks) C++17
59 / 100
 2000 ms 158340 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 = 2e9 + 7;
vector<pii> g[N];
int n, s, t, par[N], dp[(1 << M) + 4][M], p[N], kd[N], bt[M], sz, pd[N], e[N];
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};
	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, 127, sizeof dp);
	int c = d.size();
	int ans = inf;
	for (int mask = 1; mask < (1 << c); ++mask) {
		sz = 0;
		for (char i = 0; i < c; i++)
			if ((mask >> i) & 1)
				bt[sz++] = i;
		for (char id1 = 0; id1 < sz; ++id1) {
			int i = bt[id1];
			int u = d[i], ku = kd[d[i]], x = mask ^ (1 << i);
			if (__builtin_popcount(mask) == 1) {
				if (f[p[s]][p[ku]].S == x && f[p[ku]][p[par[u]]].S == x)
					dp[mask][i] = f[p[s]][p[ku]].F + f[p[ku]][p[par[u]]].F;
			}
			else {
				for (char id2 = 0; id2 < c; ++id2)
					if (id2 != id1 && dp[x][bt[id2]] < inf) {
						char j = bt[id2];
						int v = d[bt[id2]];
						if ((f[p[par[v]]][p[ku]].S | x) == x && (f[p[ku]][p[par[u]]].S | x) == x)
							dp[mask][i] = min(dp[mask][i], dp[x][j] + f[p[par[v]]][p[ku]].F + f[p[ku]][p[par[u]]].F);
					}
			}
			if ((f[p[par[u]]][p[t]].S | mask) == mask)
				ans = min(ans, dp[mask][i] + f[p[par[u]]][p[t]].F);
		}
	}
	if (f[p[s]][p[t]].S == 0)
		ans = f[p[s]][p[t]].F;
	cout << ((ans == inf)? -1 : ans) << '\n';
}

int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	ip(), solve();
	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:75:15: warning: array subscript has type 'char' [-Wchar-subscripts]
   75 |    int i = bt[id1];
      |               ^~~
Main.cpp:83:33: warning: array subscript has type 'char' [-Wchar-subscripts]
   83 |      if (id2 != id1 && dp[x][bt[id2]] < inf) {
      |                                 ^~~
Main.cpp:84:19: warning: array subscript has type 'char' [-Wchar-subscripts]
   84 |       char j = bt[id2];
      |                   ^~~
Main.cpp:85:20: warning: array subscript has type 'char' [-Wchar-subscripts]
   85 |       int v = d[bt[id2]];
      |                    ^~~
Main.cpp:87:45: warning: array subscript has type 'char' [-Wchar-subscripts]
   87 |        dp[mask][i] = min(dp[mask][i], dp[x][j] + f[p[par[v]]][p[ku]].F + f[p[ku]][p[par[u]]].F);
      |                                             ^

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 105812 KB Output is correct
2 Correct 34 ms 105808 KB Output is correct
3 Correct 92 ms 110840 KB Output is correct
4 Correct 91 ms 111032 KB Output is correct
5 Correct 92 ms 110928 KB Output is correct
6 Correct 92 ms 110932 KB Output is correct
7 Correct 89 ms 110928 KB Output is correct
8 Correct 94 ms 110932 KB Output is correct
9 Correct 91 ms 111108 KB Output is correct
10 Correct 91 ms 110892 KB Output is correct
11 Correct 90 ms 110932 KB Output is correct
12 Correct 93 ms 113112 KB Output is correct
13 Correct 96 ms 114076 KB Output is correct
14 Correct 91 ms 112720 KB Output is correct
15 Correct 97 ms 112952 KB Output is correct
16 Correct 94 ms 114256 KB Output is correct
17 Correct 102 ms 114068 KB Output is correct
18 Correct 94 ms 114516 KB Output is correct
19 Correct 96 ms 119116 KB Output is correct
20 Correct 97 ms 119380 KB Output is correct
21 Correct 98 ms 119376 KB Output is correct
22 Correct 38 ms 106076 KB Output is correct
23 Correct 40 ms 106068 KB Output is correct
24 Correct 36 ms 106076 KB Output is correct
25 Correct 37 ms 105828 KB Output is correct
26 Correct 37 ms 106048 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 105816 KB Output is correct
2 Correct 38 ms 105816 KB Output is correct
3 Correct 36 ms 105952 KB Output is correct
4 Correct 39 ms 106064 KB Output is correct
5 Correct 137 ms 106464 KB Output is correct
6 Correct 143 ms 106332 KB Output is correct
7 Correct 140 ms 106476 KB Output is correct
8 Correct 152 ms 106244 KB Output is correct
9 Correct 140 ms 106320 KB Output is correct
10 Correct 146 ms 106316 KB Output is correct
11 Correct 137 ms 106492 KB Output is correct
12 Correct 138 ms 106408 KB Output is correct
13 Correct 140 ms 106472 KB Output is correct
14 Correct 139 ms 106324 KB Output is correct
15 Correct 138 ms 106320 KB Output is correct
16 Correct 145 ms 106324 KB Output is correct
17 Correct 147 ms 106516 KB Output is correct
18 Correct 142 ms 106636 KB Output is correct
19 Correct 150 ms 106576 KB Output is correct
20 Correct 159 ms 106668 KB Output is correct
21 Correct 150 ms 106492 KB Output is correct
22 Correct 138 ms 106908 KB Output is correct
23 Correct 144 ms 106832 KB Output is correct
24 Correct 138 ms 107052 KB Output is correct
25 Correct 672 ms 105812 KB Output is correct

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 105812 KB Output is correct
2 Correct 34 ms 105808 KB Output is correct
3 Correct 92 ms 110840 KB Output is correct
4 Correct 91 ms 111032 KB Output is correct
5 Correct 92 ms 110928 KB Output is correct
6 Correct 92 ms 110932 KB Output is correct
7 Correct 89 ms 110928 KB Output is correct
8 Correct 94 ms 110932 KB Output is correct
9 Correct 91 ms 111108 KB Output is correct
10 Correct 91 ms 110892 KB Output is correct
11 Correct 90 ms 110932 KB Output is correct
12 Correct 93 ms 113112 KB Output is correct
13 Correct 96 ms 114076 KB Output is correct
14 Correct 91 ms 112720 KB Output is correct
15 Correct 97 ms 112952 KB Output is correct
16 Correct 94 ms 114256 KB Output is correct
17 Correct 102 ms 114068 KB Output is correct
18 Correct 94 ms 114516 KB Output is correct
19 Correct 96 ms 119116 KB Output is correct
20 Correct 97 ms 119380 KB Output is correct
21 Correct 98 ms 119376 KB Output is correct
22 Correct 38 ms 106076 KB Output is correct
23 Correct 40 ms 106068 KB Output is correct
24 Correct 36 ms 106076 KB Output is correct
25 Correct 37 ms 105828 KB Output is correct
26 Correct 37 ms 106048 KB Output is correct
27 Correct 39 ms 105816 KB Output is correct
28 Correct 38 ms 105816 KB Output is correct
29 Correct 36 ms 105952 KB Output is correct
30 Correct 39 ms 106064 KB Output is correct
31 Correct 137 ms 106464 KB Output is correct
32 Correct 143 ms 106332 KB Output is correct
33 Correct 140 ms 106476 KB Output is correct
34 Correct 152 ms 106244 KB Output is correct
35 Correct 140 ms 106320 KB Output is correct
36 Correct 146 ms 106316 KB Output is correct
37 Correct 137 ms 106492 KB Output is correct
38 Correct 138 ms 106408 KB Output is correct
39 Correct 140 ms 106472 KB Output is correct
40 Correct 139 ms 106324 KB Output is correct
41 Correct 138 ms 106320 KB Output is correct
42 Correct 145 ms 106324 KB Output is correct
43 Correct 147 ms 106516 KB Output is correct
44 Correct 142 ms 106636 KB Output is correct
45 Correct 150 ms 106576 KB Output is correct
46 Correct 159 ms 106668 KB Output is correct
47 Correct 150 ms 106492 KB Output is correct
48 Correct 138 ms 106908 KB Output is correct
49 Correct 144 ms 106832 KB Output is correct
50 Correct 138 ms 107052 KB Output is correct
51 Correct 672 ms 105812 KB Output is correct
52 Execution timed out 2073 ms 158340 KB Time limit exceeded
53 Halted 0 ms 0 KB -