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Submission #635733

# Submission time Handle Problem Language Result Execution time Memory
635733 2022-08-26T17:56:39 Z MohammadAghil LOSTIKS (INOI20_lostiks) C++17
59 / 100
 2000 ms 121916 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("Ofast,unroll-loops")
//#pragma GCC target ("avx2")
using namespace std;

typedef long long ll;
typedef pair<int, int> pp;

#define rep(i,l,r) for(int i = (l); i < (r); i++)
#define per(i,r,l) for(int i = (r); i >= (l); i--)
#define all(x) begin(x), end(x)
#define sz(x) (int)x.size()
#define pb push_back
#define ff first
#define ss second

void dbg(){
    cerr << endl;
}
template<typename Head, typename... Tail> void dbg(Head h, Tail... t){
    cerr << " " << h << ",";
    dbg(t...);
}
#define er(...) cerr << __LINE__ << " <" << #__VA_ARGS__ << ">:", dbg(__VA_ARGS__)

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void IOS(){
    cin.tie(0) -> sync_with_stdio(0);
//    #ifndef ONLINE_JUDGE
//        freopen("inp.txt", "r", stdin);
//        freopen("out.txt", "w", stdout);
//    #endif
}

const ll mod = 1e9 + 7, maxn = 1e6 + 5, maxm = 20, inf = ll(1e9) + 5;

int val[maxn], ed[maxm], nxt[maxm], tmp, n;
vector<pp> adj[maxn];

void dfs(int r, int p){
    val[r] |= val[p];
    for(auto&[c, w]: adj[r]) if(c - p){
        if(w + 1){
            ed[tmp] = r;
            nxt[tmp] = w;
            val[c] = 1<<tmp;
            tmp++;
            dfs(c, r);
        } else{
            dfs(c, r);
        }
    }
}

int dist[maxm + 1][maxn], dq[maxn], st, en, tmp_vl[maxm][maxm];

void dfs2(int r, int id){
//    vector<pp> stk;
//    for(auto&[c, w]: adj[r]) if(c - p){
//        dist[id][c] = dist[id][r] + 1;
//        dfs2(c, r);
//    }
    dq[st = 0]  = r, en = 1;
    fill(dist[id], dist[id] + n, -1);
    dist[id][r] = 0;
    while(st < en){
        int r = dq[st++];
        for(auto&[c, w]: adj[r]) if(dist[id][c] == -1){
            dist[id][c] = dist[id][r] + 1;
            dq[en++] = c;
        }
    }
}

int dp[maxm][1<<maxm];

int main(){ IOS();
    int s, t; cin >> n >> s >> t; s--, t--;
    int m = 0;
    rep(i,1,n){
        int u, v, w; cin >> u >> v >> w; u--, v--, w--;
        adj[u].pb({v, w});
        adj[v].pb({u, w});
        m += w != -1;
    }
    dfs(s, -1);
    rep(i,0,m){
        dfs2(ed[i], i);
    }
    dfs2(s, m);

    rep(i,0,m){
        rep(j,0,m){
            tmp_vl[i][j] = dist[i][nxt[j]] + dist[j][nxt[j]];
        }
    }

    auto chk = [&](int msk, int r){
        return (val[r]&msk) == val[r];
    };
    vector<int> is(m), nis(m);
    int ptr_is = 0, ptr_nis = 0;
    per(i,(1<<m)-1,1){
        ptr_is = ptr_nis = 0;
        rep(e,0,m) {
            if(i>>e&1){
                if(chk(i, ed[e])) is[ptr_is++] = e;
            }else{
                if(chk(i, nxt[e]) && chk(i, ed[e])) nis[ptr_nis++] = e;
            }
        }
        rep(x,0,ptr_is){
            int e = is[x];
            dp[e][i] = inf;
            if(chk(i, t)){
                dp[e][i] = dist[e][t];
            }else{
                rep(j,0,ptr_nis){
                    int x = nis[j];
                    dp[e][i] = min(dp[e][i], dp[x][i^(1<<x)] + tmp_vl[e][x]);
                }
            }
        }
    }
    int ans = inf;
    rep(i,0,m){
        if(chk(0, nxt[i]) && chk(0, ed[i])) ans = min(ans, dp[i][1<<i] + dist[m][nxt[i]] + dist[i][nxt[i]]);
    }
    if(chk(0, t)){
        ans = dist[m][t];
    }
    cout << (ans == inf? -1: ans) << '\n';
    return 0;
}

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 82 ms 31692 KB Output is correct
4 Correct 80 ms 31620 KB Output is correct
5 Correct 79 ms 31740 KB Output is correct
6 Correct 79 ms 31680 KB Output is correct
7 Correct 82 ms 31724 KB Output is correct
8 Correct 88 ms 31796 KB Output is correct
9 Correct 81 ms 32040 KB Output is correct
10 Correct 98 ms 31804 KB Output is correct
11 Correct 90 ms 31804 KB Output is correct
12 Correct 85 ms 33144 KB Output is correct
13 Correct 82 ms 32824 KB Output is correct
14 Correct 73 ms 32372 KB Output is correct
15 Correct 94 ms 33324 KB Output is correct
16 Correct 71 ms 33988 KB Output is correct
17 Correct 88 ms 34056 KB Output is correct
18 Correct 80 ms 34616 KB Output is correct
19 Correct 80 ms 38656 KB Output is correct
20 Correct 75 ms 38400 KB Output is correct
21 Correct 74 ms 38316 KB Output is correct
22 Correct 13 ms 23892 KB Output is correct
23 Correct 13 ms 23892 KB Output is correct
24 Correct 13 ms 23892 KB Output is correct
25 Correct 14 ms 23920 KB Output is correct
26 Correct 13 ms 23956 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23764 KB Output is correct
3 Correct 12 ms 24020 KB Output is correct
4 Correct 14 ms 24040 KB Output is correct
5 Correct 91 ms 52828 KB Output is correct
6 Correct 77 ms 51764 KB Output is correct
7 Correct 89 ms 52828 KB Output is correct
8 Correct 80 ms 54608 KB Output is correct
9 Correct 88 ms 51704 KB Output is correct
10 Correct 64 ms 47576 KB Output is correct
11 Correct 60 ms 47508 KB Output is correct
12 Correct 62 ms 47436 KB Output is correct
13 Correct 62 ms 47432 KB Output is correct
14 Correct 60 ms 47436 KB Output is correct
15 Correct 79 ms 53336 KB Output is correct
16 Correct 98 ms 53036 KB Output is correct
17 Correct 85 ms 53484 KB Output is correct
18 Correct 60 ms 47564 KB Output is correct
19 Correct 67 ms 47580 KB Output is correct
20 Correct 60 ms 47564 KB Output is correct
21 Correct 65 ms 47680 KB Output is correct
22 Correct 64 ms 47904 KB Output is correct
23 Correct 61 ms 47908 KB Output is correct
24 Correct 59 ms 47900 KB Output is correct
25 Correct 240 ms 89612 KB Output is correct

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 82 ms 31692 KB Output is correct
4 Correct 80 ms 31620 KB Output is correct
5 Correct 79 ms 31740 KB Output is correct
6 Correct 79 ms 31680 KB Output is correct
7 Correct 82 ms 31724 KB Output is correct
8 Correct 88 ms 31796 KB Output is correct
9 Correct 81 ms 32040 KB Output is correct
10 Correct 98 ms 31804 KB Output is correct
11 Correct 90 ms 31804 KB Output is correct
12 Correct 85 ms 33144 KB Output is correct
13 Correct 82 ms 32824 KB Output is correct
14 Correct 73 ms 32372 KB Output is correct
15 Correct 94 ms 33324 KB Output is correct
16 Correct 71 ms 33988 KB Output is correct
17 Correct 88 ms 34056 KB Output is correct
18 Correct 80 ms 34616 KB Output is correct
19 Correct 80 ms 38656 KB Output is correct
20 Correct 75 ms 38400 KB Output is correct
21 Correct 74 ms 38316 KB Output is correct
22 Correct 13 ms 23892 KB Output is correct
23 Correct 13 ms 23892 KB Output is correct
24 Correct 13 ms 23892 KB Output is correct
25 Correct 14 ms 23920 KB Output is correct
26 Correct 13 ms 23956 KB Output is correct
27 Correct 12 ms 23764 KB Output is correct
28 Correct 12 ms 23764 KB Output is correct
29 Correct 12 ms 24020 KB Output is correct
30 Correct 14 ms 24040 KB Output is correct
31 Correct 91 ms 52828 KB Output is correct
32 Correct 77 ms 51764 KB Output is correct
33 Correct 89 ms 52828 KB Output is correct
34 Correct 80 ms 54608 KB Output is correct
35 Correct 88 ms 51704 KB Output is correct
36 Correct 64 ms 47576 KB Output is correct
37 Correct 60 ms 47508 KB Output is correct
38 Correct 62 ms 47436 KB Output is correct
39 Correct 62 ms 47432 KB Output is correct
40 Correct 60 ms 47436 KB Output is correct
41 Correct 79 ms 53336 KB Output is correct
42 Correct 98 ms 53036 KB Output is correct
43 Correct 85 ms 53484 KB Output is correct
44 Correct 60 ms 47564 KB Output is correct
45 Correct 67 ms 47580 KB Output is correct
46 Correct 60 ms 47564 KB Output is correct
47 Correct 65 ms 47680 KB Output is correct
48 Correct 64 ms 47904 KB Output is correct
49 Correct 61 ms 47908 KB Output is correct
50 Correct 59 ms 47900 KB Output is correct
51 Correct 240 ms 89612 KB Output is correct
52 Correct 1805 ms 110280 KB Output is correct
53 Execution timed out 2089 ms 121916 KB Time limit exceeded
54 Halted 0 ms 0 KB -