oj.uz

Submission #999419

# Submission time Handle Problem Language Result Execution time Memory
999419 2024-06-15T12:54:02 Z Huseyn123 LOSTIKS (INOI20_lostiks) C++17
23 / 100
 2000 ms 179024 KB 
#include <bits/stdc++.h>
#define int ll
#define MAX 1000001
#define INF INT_MAX
#define MOD 1000000007
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ins insert
#define ff first
#define ss second 
#define all(a) a.begin(),a.end()
#define lb(a,b) lower_bound(all(a),b)
#define ub(a,b) upper_bound(all(a),b)
#define sortv(a) sort(all(a))
#define outputar(a,b){\
    for(int i=0;i<b;i++){\
        cout << a[i] << " ";\
    }\
    cout << endl;\
}
#define outputvec(a){\
    for(auto x:a){\
        cout << (int)x << " ";\
    }\
    cout << endl;\
}
#define reset(a,n,v){\
    for(int i=0;i<n;i++){\
        a[i]=v;\
    }\
}
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef tuple<ll,ll,ll> tll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef double db;
typedef long double ldb;
inline void USACO(string filename){
  freopen((filename+".in").c_str(),"r",stdin);
  freopen((filename+".out").c_str(),"w",stdout);
}
int n,q,t=1,m,k,x,y,z,x2,y2,z2,a[MAX],b[MAX],d[MAX];
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//string s[MAX],str[MAX];
//int e[1001][1001];
string s1,s2,s3;
const int mod = 998244353;
int dx[4]={0,1,0,-1};
int dy[4]={1,0,-1,0};
vector<vector<int>> g;
int st[MAX][20],dep[MAX],pre[MAX],cnt=0;
int lca(int x,int y){
    if(dep[x]<dep[y]){
        swap(x,y);
    }
    int h=dep[x]-dep[y];
    for(int i=0;i<20;i++){
        if((h&(1<<i))){
            x=st[x][i];
        }
    }
    if(x==y){
        return x;
    }
    for(int i=19;i>=0;i--){
        if(st[x][i]!=st[y][i]){
            x=st[x][i];
            y=st[y][i];
        }
    }
    return pre[x];
}
vector<array<int,3>> c;
bool check(int x,int y,int z){
    bool ok=true;
    for(int i=0;i<cnt;i++){
        if(!(x&(1<<i))){
            int h1,h2,h3;
            h1=lca(c[i][0],y);
            h2=lca(c[i][0],z);
            h3=lca(y,z);
            if((h1==c[i][0] && dep[h1]>dep[h3]) || (h2==c[i][0] && dep[h2]>dep[h3])){
                ok=false;
            }
        }
    }
    return ok;
}
void dfs(int v,int prev){
    st[v][0]=prev;
    pre[v]=prev;
    for(auto x:g[v]){
        if(x==prev){
            continue;
        }
        dep[x]=dep[v]+1;
        dfs(x,v);
    }
}
int dist(int x,int y){
    return dep[x]+dep[y]-2*dep[lca(x,y)];
}
int dp[1<<20][21];
void solve(){
    cin >> n;
    g.clear();
    g.resize(n+1);
    cin >> m >> k; 
    for(int i=0;i<n-1;i++){
        cin >> x >> y >> z;
        g[x].pb(y);
        g[y].pb(x);
        a[i]=z;
        if(a[i]!=0){
            c.pb({x,y,i});
            cnt++;
        }
    }
    dfs(m,-1);
    for(int i=1;i<20;i++){
        for(int j=1;j<=n;j++){
            if(st[j][i-1]!=-1){
                st[j][i]=st[st[j][i-1]][i-1];
            }
        }
    }
    for(int i=0;i<cnt;i++){
        int n1,n2; 
        n1=c[0][0];
        n2=c[0][1];
        if(dep[n1]<dep[n2]){
            swap(n1,n2);
        }
        c.pb({n1,n2,c[0][2]});
        c.erase(c.begin());
    }
    int h=(1<<cnt);
    for(int i=0;i<h;i++){
        for(int j=0;j<=cnt;j++){
            dp[i][j]=INF;
        }
    }
    dp[0][cnt]=0;
    int res=INF;
    for(int i=0;i<h;i++){
        for(int j=0;j<=cnt;j++){
            if(dp[i][j]==INF){
                continue;
            }
            int num; 
            if(j==cnt){
                num=m;
            }
            else{
                num=c[j][1];
            }
            for(int z=0;z<cnt;z++){
                if(!(i&(1<<z)) && check(i,num,a[c[z][2]]) && check(i,a[c[z][2]],c[z][1])){
                    dp[i+(1<<z)][z]=min(dp[i+(1<<z)][z],dp[i][j]+dist(num,a[c[z][2]])+dist(a[c[z][2]],c[z][1]));
                }
            }
            if(check(i,num,k)){
                res=min(res,dp[i][j]+dist(num,k)); 
            }
        }
    }
    if(res==INF){
        res=-1;
    }
    cout << res << "\n";
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //freopen("input13.txt","r",stdin);
    //cin >> t;
    ll cnt1=1;
    while(t--){
        solve();
        cnt1++; 
    }
}

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8792 KB Output is correct
2 Correct 1 ms 8536 KB Output is correct
3 Correct 37 ms 35924 KB Output is correct
4 Correct 48 ms 36132 KB Output is correct
5 Correct 42 ms 35932 KB Output is correct
6 Correct 39 ms 35408 KB Output is correct
7 Correct 33 ms 36008 KB Output is correct
8 Correct 41 ms 35668 KB Output is correct
9 Correct 34 ms 35676 KB Output is correct
10 Correct 38 ms 35512 KB Output is correct
11 Correct 47 ms 35436 KB Output is correct
12 Correct 38 ms 36444 KB Output is correct
13 Correct 38 ms 36188 KB Output is correct
14 Correct 34 ms 35932 KB Output is correct
15 Correct 37 ms 36484 KB Output is correct
16 Correct 43 ms 36688 KB Output is correct
17 Correct 35 ms 37132 KB Output is correct
18 Correct 36 ms 37212 KB Output is correct
19 Correct 52 ms 39764 KB Output is correct
20 Correct 35 ms 39760 KB Output is correct
21 Correct 35 ms 39252 KB Output is correct
22 Correct 1 ms 8540 KB Output is correct
23 Correct 1 ms 8540 KB Output is correct
24 Correct 1 ms 8536 KB Output is correct
25 Correct 1 ms 8540 KB Output is correct
26 Correct 1 ms 8540 KB Output is correct

Subtask #2
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 8868 KB Output is correct
4 Correct 2 ms 8792 KB Output is correct
5 Correct 98 ms 97452 KB Output is correct
6 Correct 51 ms 97368 KB Output is correct
7 Correct 265 ms 97368 KB Output is correct
8 Correct 243 ms 97400 KB Output is correct
9 Correct 185 ms 97372 KB Output is correct
10 Correct 30 ms 97372 KB Output is correct
11 Correct 31 ms 97444 KB Output is correct
12 Correct 30 ms 97372 KB Output is correct
13 Correct 30 ms 97372 KB Output is correct
14 Correct 30 ms 97372 KB Output is correct
15 Correct 72 ms 97372 KB Output is correct
16 Correct 99 ms 97372 KB Output is correct
17 Correct 44 ms 97384 KB Output is correct
18 Correct 32 ms 97628 KB Output is correct
19 Correct 29 ms 97628 KB Output is correct
20 Correct 31 ms 97628 KB Output is correct
21 Correct 30 ms 97636 KB Output is correct
22 Correct 31 ms 97628 KB Output is correct
23 Correct 32 ms 97628 KB Output is correct
24 Correct 32 ms 97624 KB Output is correct
25 Execution timed out 2027 ms 179024 KB Time limit exceeded
26 Halted 0 ms 0 KB -

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8792 KB Output is correct
2 Correct 1 ms 8536 KB Output is correct
3 Correct 37 ms 35924 KB Output is correct
4 Correct 48 ms 36132 KB Output is correct
5 Correct 42 ms 35932 KB Output is correct
6 Correct 39 ms 35408 KB Output is correct
7 Correct 33 ms 36008 KB Output is correct
8 Correct 41 ms 35668 KB Output is correct
9 Correct 34 ms 35676 KB Output is correct
10 Correct 38 ms 35512 KB Output is correct
11 Correct 47 ms 35436 KB Output is correct
12 Correct 38 ms 36444 KB Output is correct
13 Correct 38 ms 36188 KB Output is correct
14 Correct 34 ms 35932 KB Output is correct
15 Correct 37 ms 36484 KB Output is correct
16 Correct 43 ms 36688 KB Output is correct
17 Correct 35 ms 37132 KB Output is correct
18 Correct 36 ms 37212 KB Output is correct
19 Correct 52 ms 39764 KB Output is correct
20 Correct 35 ms 39760 KB Output is correct
21 Correct 35 ms 39252 KB Output is correct
22 Correct 1 ms 8540 KB Output is correct
23 Correct 1 ms 8540 KB Output is correct
24 Correct 1 ms 8536 KB Output is correct
25 Correct 1 ms 8540 KB Output is correct
26 Correct 1 ms 8540 KB Output is correct
27 Correct 1 ms 8540 KB Output is correct
28 Correct 1 ms 8540 KB Output is correct
29 Correct 1 ms 8868 KB Output is correct
30 Correct 2 ms 8792 KB Output is correct
31 Correct 98 ms 97452 KB Output is correct
32 Correct 51 ms 97368 KB Output is correct
33 Correct 265 ms 97368 KB Output is correct
34 Correct 243 ms 97400 KB Output is correct
35 Correct 185 ms 97372 KB Output is correct
36 Correct 30 ms 97372 KB Output is correct
37 Correct 31 ms 97444 KB Output is correct
38 Correct 30 ms 97372 KB Output is correct
39 Correct 30 ms 97372 KB Output is correct
40 Correct 30 ms 97372 KB Output is correct
41 Correct 72 ms 97372 KB Output is correct
42 Correct 99 ms 97372 KB Output is correct
43 Correct 44 ms 97384 KB Output is correct
44 Correct 32 ms 97628 KB Output is correct
45 Correct 29 ms 97628 KB Output is correct
46 Correct 31 ms 97628 KB Output is correct
47 Correct 30 ms 97636 KB Output is correct
48 Correct 31 ms 97628 KB Output is correct
49 Correct 32 ms 97628 KB Output is correct
50 Correct 32 ms 97624 KB Output is correct
51 Execution timed out 2027 ms 179024 KB Time limit exceeded
52 Halted 0 ms 0 KB -