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Submission #635715

# Submission time Handle Problem Language Result Execution time Memory
635715 2022-08-26T17:38:23 Z MohammadAghil LOSTIKS (INOI20_lostiks) C++17
59 / 100
 2000 ms 106092 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("Ofast")
//#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;
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 + 5][maxn], id;

void dfs2(int r, int p){
    for(auto&[c, w]: adj[r]) if(c - p){
        dist[id][c] = dist[id][r] + 1;
        dfs2(c, r);
    }
}

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

int main(){ IOS();
    int n, 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){
        id = i;
        dfs2(ed[i], -1);
    }
    id = m;
    dfs2(s, -1);
    auto chk = [&](int msk, int r){
        return (val[r]&msk) == val[r];
    };
    per(i,(1<<m)-1,1){
        vector<int> is, nis;
        rep(e,0,m) {
            if(i>>e&1){
                if(chk(i, ed[e])) is.pb(e);
            }else{
                if(chk(i, nxt[e]) && chk(i, ed[e])) nis.pb(e);
            }
        }
        for(int e: is){
            dp[i][e] = inf;
            if(chk(i, t)){
                dp[i][e] = dist[e][t];
            }else{
                for(int x: nis){
                    dp[i][e] = min(dp[i][e], dp[i^(1<<x)][x] + dist[e][nxt[x]] + dist[x][nxt[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 14 ms 23764 KB Output is correct
2 Correct 13 ms 23796 KB Output is correct
3 Correct 94 ms 31200 KB Output is correct
4 Correct 82 ms 31148 KB Output is correct
5 Correct 83 ms 31256 KB Output is correct
6 Correct 88 ms 31292 KB Output is correct
7 Correct 85 ms 31300 KB Output is correct
8 Correct 95 ms 31340 KB Output is correct
9 Correct 80 ms 31408 KB Output is correct
10 Correct 78 ms 31340 KB Output is correct
11 Correct 78 ms 31300 KB Output is correct
12 Correct 93 ms 32312 KB Output is correct
13 Correct 79 ms 32068 KB Output is correct
14 Correct 67 ms 31744 KB Output is correct
15 Correct 71 ms 32404 KB Output is correct
16 Correct 77 ms 33004 KB Output is correct
17 Correct 76 ms 32980 KB Output is correct
18 Correct 73 ms 33532 KB Output is correct
19 Correct 75 ms 36592 KB Output is correct
20 Correct 83 ms 36508 KB Output is correct
21 Correct 83 ms 36296 KB Output is correct
22 Correct 13 ms 23764 KB Output is correct
23 Correct 13 ms 23800 KB Output is correct
24 Correct 12 ms 23860 KB Output is correct
25 Correct 12 ms 23892 KB Output is correct
26 Correct 13 ms 23848 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 23892 KB Output is correct
4 Correct 12 ms 23928 KB Output is correct
5 Correct 187 ms 65740 KB Output is correct
6 Correct 139 ms 65828 KB Output is correct
7 Correct 204 ms 65780 KB Output is correct
8 Correct 163 ms 65756 KB Output is correct
9 Correct 179 ms 65732 KB Output is correct
10 Correct 91 ms 65824 KB Output is correct
11 Correct 89 ms 65868 KB Output is correct
12 Correct 93 ms 65860 KB Output is correct
13 Correct 94 ms 65800 KB Output is correct
14 Correct 96 ms 65816 KB Output is correct
15 Correct 156 ms 65772 KB Output is correct
16 Correct 203 ms 65952 KB Output is correct
17 Correct 188 ms 65796 KB Output is correct
18 Correct 114 ms 65868 KB Output is correct
19 Correct 88 ms 65924 KB Output is correct
20 Correct 90 ms 65924 KB Output is correct
21 Correct 87 ms 65980 KB Output is correct
22 Correct 112 ms 66228 KB Output is correct
23 Correct 102 ms 66224 KB Output is correct
24 Correct 105 ms 66240 KB Output is correct
25 Correct 612 ms 106092 KB Output is correct

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23764 KB Output is correct
2 Correct 13 ms 23796 KB Output is correct
3 Correct 94 ms 31200 KB Output is correct
4 Correct 82 ms 31148 KB Output is correct
5 Correct 83 ms 31256 KB Output is correct
6 Correct 88 ms 31292 KB Output is correct
7 Correct 85 ms 31300 KB Output is correct
8 Correct 95 ms 31340 KB Output is correct
9 Correct 80 ms 31408 KB Output is correct
10 Correct 78 ms 31340 KB Output is correct
11 Correct 78 ms 31300 KB Output is correct
12 Correct 93 ms 32312 KB Output is correct
13 Correct 79 ms 32068 KB Output is correct
14 Correct 67 ms 31744 KB Output is correct
15 Correct 71 ms 32404 KB Output is correct
16 Correct 77 ms 33004 KB Output is correct
17 Correct 76 ms 32980 KB Output is correct
18 Correct 73 ms 33532 KB Output is correct
19 Correct 75 ms 36592 KB Output is correct
20 Correct 83 ms 36508 KB Output is correct
21 Correct 83 ms 36296 KB Output is correct
22 Correct 13 ms 23764 KB Output is correct
23 Correct 13 ms 23800 KB Output is correct
24 Correct 12 ms 23860 KB Output is correct
25 Correct 12 ms 23892 KB Output is correct
26 Correct 13 ms 23848 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 23892 KB Output is correct
30 Correct 12 ms 23928 KB Output is correct
31 Correct 187 ms 65740 KB Output is correct
32 Correct 139 ms 65828 KB Output is correct
33 Correct 204 ms 65780 KB Output is correct
34 Correct 163 ms 65756 KB Output is correct
35 Correct 179 ms 65732 KB Output is correct
36 Correct 91 ms 65824 KB Output is correct
37 Correct 89 ms 65868 KB Output is correct
38 Correct 93 ms 65860 KB Output is correct
39 Correct 94 ms 65800 KB Output is correct
40 Correct 96 ms 65816 KB Output is correct
41 Correct 156 ms 65772 KB Output is correct
42 Correct 203 ms 65952 KB Output is correct
43 Correct 188 ms 65796 KB Output is correct
44 Correct 114 ms 65868 KB Output is correct
45 Correct 88 ms 65924 KB Output is correct
46 Correct 90 ms 65924 KB Output is correct
47 Correct 87 ms 65980 KB Output is correct
48 Correct 112 ms 66228 KB Output is correct
49 Correct 102 ms 66224 KB Output is correct
50 Correct 105 ms 66240 KB Output is correct
51 Correct 612 ms 106092 KB Output is correct
52 Execution timed out 2083 ms 105000 KB Time limit exceeded
53 Halted 0 ms 0 KB -