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Submission #635735

# Submission time Handle Problem Language Result Execution time Memory
635735 2022-08-26T17:59:30 Z MohammadAghil LOSTIKS (INOI20_lostiks) C++17
59 / 100
 2000 ms 122024 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){
                    dp[e][i] = min(dp[e][i], dp[nis[j]][i^(1<<nis[j])] + tmp_vl[e][nis[j]]);
                }
            }
        }
    }
    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 23876 KB Output is correct
3 Correct 82 ms 31664 KB Output is correct
4 Correct 86 ms 31676 KB Output is correct
5 Correct 79 ms 31652 KB Output is correct
6 Correct 75 ms 31692 KB Output is correct
7 Correct 75 ms 31740 KB Output is correct
8 Correct 74 ms 31776 KB Output is correct
9 Correct 89 ms 31928 KB Output is correct
10 Correct 84 ms 31840 KB Output is correct
11 Correct 74 ms 31788 KB Output is correct
12 Correct 75 ms 33236 KB Output is correct
13 Correct 76 ms 32840 KB Output is correct
14 Correct 80 ms 32364 KB Output is correct
15 Correct 73 ms 33288 KB Output is correct
16 Correct 71 ms 34044 KB Output is correct
17 Correct 74 ms 34040 KB Output is correct
18 Correct 76 ms 34552 KB Output is correct
19 Correct 71 ms 38604 KB Output is correct
20 Correct 72 ms 38492 KB Output is correct
21 Correct 69 ms 38248 KB Output is correct
22 Correct 14 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 13 ms 23976 KB Output is correct
26 Correct 14 ms 23892 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 12 ms 24040 KB Output is correct
5 Correct 92 ms 52836 KB Output is correct
6 Correct 82 ms 51652 KB Output is correct
7 Correct 97 ms 52788 KB Output is correct
8 Correct 86 ms 54604 KB Output is correct
9 Correct 93 ms 51708 KB Output is correct
10 Correct 70 ms 47484 KB Output is correct
11 Correct 72 ms 47548 KB Output is correct
12 Correct 73 ms 47424 KB Output is correct
13 Correct 74 ms 47440 KB Output is correct
14 Correct 84 ms 47468 KB Output is correct
15 Correct 83 ms 53424 KB Output is correct
16 Correct 99 ms 52968 KB Output is correct
17 Correct 89 ms 53568 KB Output is correct
18 Correct 74 ms 47564 KB Output is correct
19 Correct 73 ms 47564 KB Output is correct
20 Correct 70 ms 47680 KB Output is correct
21 Correct 71 ms 47708 KB Output is correct
22 Correct 71 ms 47932 KB Output is correct
23 Correct 76 ms 47964 KB Output is correct
24 Correct 81 ms 48020 KB Output is correct
25 Correct 262 ms 89588 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 23876 KB Output is correct
3 Correct 82 ms 31664 KB Output is correct
4 Correct 86 ms 31676 KB Output is correct
5 Correct 79 ms 31652 KB Output is correct
6 Correct 75 ms 31692 KB Output is correct
7 Correct 75 ms 31740 KB Output is correct
8 Correct 74 ms 31776 KB Output is correct
9 Correct 89 ms 31928 KB Output is correct
10 Correct 84 ms 31840 KB Output is correct
11 Correct 74 ms 31788 KB Output is correct
12 Correct 75 ms 33236 KB Output is correct
13 Correct 76 ms 32840 KB Output is correct
14 Correct 80 ms 32364 KB Output is correct
15 Correct 73 ms 33288 KB Output is correct
16 Correct 71 ms 34044 KB Output is correct
17 Correct 74 ms 34040 KB Output is correct
18 Correct 76 ms 34552 KB Output is correct
19 Correct 71 ms 38604 KB Output is correct
20 Correct 72 ms 38492 KB Output is correct
21 Correct 69 ms 38248 KB Output is correct
22 Correct 14 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 13 ms 23976 KB Output is correct
26 Correct 14 ms 23892 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 12 ms 24040 KB Output is correct
31 Correct 92 ms 52836 KB Output is correct
32 Correct 82 ms 51652 KB Output is correct
33 Correct 97 ms 52788 KB Output is correct
34 Correct 86 ms 54604 KB Output is correct
35 Correct 93 ms 51708 KB Output is correct
36 Correct 70 ms 47484 KB Output is correct
37 Correct 72 ms 47548 KB Output is correct
38 Correct 73 ms 47424 KB Output is correct
39 Correct 74 ms 47440 KB Output is correct
40 Correct 84 ms 47468 KB Output is correct
41 Correct 83 ms 53424 KB Output is correct
42 Correct 99 ms 52968 KB Output is correct
43 Correct 89 ms 53568 KB Output is correct
44 Correct 74 ms 47564 KB Output is correct
45 Correct 73 ms 47564 KB Output is correct
46 Correct 70 ms 47680 KB Output is correct
47 Correct 71 ms 47708 KB Output is correct
48 Correct 71 ms 47932 KB Output is correct
49 Correct 76 ms 47964 KB Output is correct
50 Correct 81 ms 48020 KB Output is correct
51 Correct 262 ms 89588 KB Output is correct
52 Correct 1820 ms 110104 KB Output is correct
53 Execution timed out 2102 ms 122024 KB Time limit exceeded
54 Halted 0 ms 0 KB -