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Submission #635732

# Submission time Handle Problem Language Result Execution time Memory
635732 2022-08-26T17:54:18 Z MohammadAghil LOSTIKS (INOI20_lostiks) C++17
59 / 100
 2000 ms 122132 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[1<<maxm][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[i][e] = inf;
            if(chk(i, t)){
                dp[i][e] = dist[e][t];
            }else{
                rep(j,0,ptr_nis){
                    int x = nis[j];
                    dp[i][e] = min(dp[i][e], dp[i^(1<<x)][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[1<<i][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 13 ms 23764 KB Output is correct
2 Correct 14 ms 23764 KB Output is correct
3 Correct 83 ms 31776 KB Output is correct
4 Correct 80 ms 31692 KB Output is correct
5 Correct 76 ms 31704 KB Output is correct
6 Correct 79 ms 31700 KB Output is correct
7 Correct 76 ms 31796 KB Output is correct
8 Correct 75 ms 31720 KB Output is correct
9 Correct 77 ms 31948 KB Output is correct
10 Correct 76 ms 31756 KB Output is correct
11 Correct 86 ms 31908 KB Output is correct
12 Correct 72 ms 33196 KB Output is correct
13 Correct 81 ms 32808 KB Output is correct
14 Correct 76 ms 32320 KB Output is correct
15 Correct 75 ms 33264 KB Output is correct
16 Correct 72 ms 33968 KB Output is correct
17 Correct 75 ms 34088 KB Output is correct
18 Correct 70 ms 34584 KB Output is correct
19 Correct 71 ms 38616 KB Output is correct
20 Correct 68 ms 38404 KB Output is correct
21 Correct 68 ms 38176 KB Output is correct
22 Correct 12 ms 23764 KB Output is correct
23 Correct 13 ms 23892 KB Output is correct
24 Correct 12 ms 23892 KB Output is correct
25 Correct 12 ms 23892 KB Output is correct
26 Correct 12 ms 23892 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23764 KB Output is correct
2 Correct 12 ms 23860 KB Output is correct
3 Correct 12 ms 23892 KB Output is correct
4 Correct 13 ms 23892 KB Output is correct
5 Correct 85 ms 65852 KB Output is correct
6 Correct 74 ms 65872 KB Output is correct
7 Correct 94 ms 65788 KB Output is correct
8 Correct 86 ms 65872 KB Output is correct
9 Correct 83 ms 65868 KB Output is correct
10 Correct 63 ms 65868 KB Output is correct
11 Correct 64 ms 65804 KB Output is correct
12 Correct 62 ms 65808 KB Output is correct
13 Correct 64 ms 65792 KB Output is correct
14 Correct 62 ms 65868 KB Output is correct
15 Correct 77 ms 65848 KB Output is correct
16 Correct 88 ms 65872 KB Output is correct
17 Correct 83 ms 65868 KB Output is correct
18 Correct 65 ms 65956 KB Output is correct
19 Correct 62 ms 65956 KB Output is correct
20 Correct 62 ms 65936 KB Output is correct
21 Correct 63 ms 65996 KB Output is correct
22 Correct 66 ms 66372 KB Output is correct
23 Correct 62 ms 66308 KB Output is correct
24 Correct 62 ms 66328 KB Output is correct
25 Correct 226 ms 105996 KB Output is correct

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 14 ms 23764 KB Output is correct
3 Correct 83 ms 31776 KB Output is correct
4 Correct 80 ms 31692 KB Output is correct
5 Correct 76 ms 31704 KB Output is correct
6 Correct 79 ms 31700 KB Output is correct
7 Correct 76 ms 31796 KB Output is correct
8 Correct 75 ms 31720 KB Output is correct
9 Correct 77 ms 31948 KB Output is correct
10 Correct 76 ms 31756 KB Output is correct
11 Correct 86 ms 31908 KB Output is correct
12 Correct 72 ms 33196 KB Output is correct
13 Correct 81 ms 32808 KB Output is correct
14 Correct 76 ms 32320 KB Output is correct
15 Correct 75 ms 33264 KB Output is correct
16 Correct 72 ms 33968 KB Output is correct
17 Correct 75 ms 34088 KB Output is correct
18 Correct 70 ms 34584 KB Output is correct
19 Correct 71 ms 38616 KB Output is correct
20 Correct 68 ms 38404 KB Output is correct
21 Correct 68 ms 38176 KB Output is correct
22 Correct 12 ms 23764 KB Output is correct
23 Correct 13 ms 23892 KB Output is correct
24 Correct 12 ms 23892 KB Output is correct
25 Correct 12 ms 23892 KB Output is correct
26 Correct 12 ms 23892 KB Output is correct
27 Correct 14 ms 23764 KB Output is correct
28 Correct 12 ms 23860 KB Output is correct
29 Correct 12 ms 23892 KB Output is correct
30 Correct 13 ms 23892 KB Output is correct
31 Correct 85 ms 65852 KB Output is correct
32 Correct 74 ms 65872 KB Output is correct
33 Correct 94 ms 65788 KB Output is correct
34 Correct 86 ms 65872 KB Output is correct
35 Correct 83 ms 65868 KB Output is correct
36 Correct 63 ms 65868 KB Output is correct
37 Correct 64 ms 65804 KB Output is correct
38 Correct 62 ms 65808 KB Output is correct
39 Correct 64 ms 65792 KB Output is correct
40 Correct 62 ms 65868 KB Output is correct
41 Correct 77 ms 65848 KB Output is correct
42 Correct 88 ms 65872 KB Output is correct
43 Correct 83 ms 65868 KB Output is correct
44 Correct 65 ms 65956 KB Output is correct
45 Correct 62 ms 65956 KB Output is correct
46 Correct 62 ms 65936 KB Output is correct
47 Correct 63 ms 65996 KB Output is correct
48 Correct 66 ms 66372 KB Output is correct
49 Correct 62 ms 66308 KB Output is correct
50 Correct 62 ms 66328 KB Output is correct
51 Correct 226 ms 105996 KB Output is correct
52 Correct 1833 ms 110092 KB Output is correct
53 Execution timed out 2016 ms 122132 KB Time limit exceeded
54 Halted 0 ms 0 KB -