oj.uz

답안 #999573

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
999573 2024-06-15T20:16:21 Z vjudge1 LOSTIKS (INOI20_lostiks) C++17
23 / 100
 2000 ms 191312 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;
vector<vector<int>> zeros;
bool check(int x,int y,int z){
    bool ok=true;
    for(auto i:zeros[x]){
            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 dis[21][21];
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<cnt;i++){
        b[i]=dist(a[c[i][2]],c[i][1]);
    }
    for(int i=0;i<=cnt;i++){
        for(int j=0;j<cnt;j++){
            int num; 
            if(i==cnt){
                num=m;
            }
            else{
                num=c[i][1];
            }
            dis[i][j]=dist(num,a[c[j][2]]);
        }
    }
    zeros.resize(h);
    for(int i=0;i<h;i++){
        for(int j=0;j<cnt;j++){
            if(!(i&(1<<j))){
                zeros[i].pb(j);
            }
        }
    }
    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(auto z:zeros[i]){
                if(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]+dis[j][z]+b[z]);
                }
            }
            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

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 10588 KB Output is correct
2 Correct 1 ms 10588 KB Output is correct
3 Correct 33 ms 30032 KB Output is correct
4 Correct 32 ms 30132 KB Output is correct
5 Correct 32 ms 30032 KB Output is correct
6 Correct 36 ms 30168 KB Output is correct
7 Correct 40 ms 30032 KB Output is correct
8 Correct 32 ms 30028 KB Output is correct
9 Correct 41 ms 30292 KB Output is correct
10 Correct 34 ms 30032 KB Output is correct
11 Correct 34 ms 30300 KB Output is correct
12 Correct 33 ms 31572 KB Output is correct
13 Correct 33 ms 31404 KB Output is correct
14 Correct 32 ms 31060 KB Output is correct
15 Correct 31 ms 31876 KB Output is correct
16 Correct 30 ms 32336 KB Output is correct
17 Correct 33 ms 32336 KB Output is correct
18 Correct 34 ms 32860 KB Output is correct
19 Correct 35 ms 36124 KB Output is correct
20 Correct 37 ms 35900 KB Output is correct
21 Correct 46 ms 35668 KB Output is correct
22 Correct 1 ms 10588 KB Output is correct
23 Correct 1 ms 10588 KB Output is correct
24 Correct 1 ms 10588 KB Output is correct
25 Correct 1 ms 10588 KB Output is correct
26 Correct 1 ms 10588 KB Output is correct

Subtask #2
0 / 36.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 10588 KB Output is correct
2 Correct 1 ms 10588 KB Output is correct
3 Correct 2 ms 10844 KB Output is correct
4 Correct 2 ms 10844 KB Output is correct
5 Correct 161 ms 102332 KB Output is correct
6 Correct 131 ms 102336 KB Output is correct
7 Correct 246 ms 102224 KB Output is correct
8 Correct 235 ms 102224 KB Output is correct
9 Correct 227 ms 102468 KB Output is correct
10 Correct 116 ms 102224 KB Output is correct
11 Correct 124 ms 102228 KB Output is correct
12 Correct 136 ms 102224 KB Output is correct
13 Correct 120 ms 102480 KB Output is correct
14 Correct 118 ms 102480 KB Output is correct
15 Correct 140 ms 102484 KB Output is correct
16 Correct 169 ms 102484 KB Output is correct
17 Correct 124 ms 102480 KB Output is correct
18 Correct 120 ms 102484 KB Output is correct
19 Correct 127 ms 102484 KB Output is correct
20 Correct 125 ms 102480 KB Output is correct
21 Correct 138 ms 102436 KB Output is correct
22 Correct 121 ms 102740 KB Output is correct
23 Correct 127 ms 102796 KB Output is correct
24 Correct 125 ms 102660 KB Output is correct
25 Execution timed out 2058 ms 191312 KB Time limit exceeded
26 Halted 0 ms 0 KB -

Subtask #3
0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 10588 KB Output is correct
2 Correct 1 ms 10588 KB Output is correct
3 Correct 33 ms 30032 KB Output is correct
4 Correct 32 ms 30132 KB Output is correct
5 Correct 32 ms 30032 KB Output is correct
6 Correct 36 ms 30168 KB Output is correct
7 Correct 40 ms 30032 KB Output is correct
8 Correct 32 ms 30028 KB Output is correct
9 Correct 41 ms 30292 KB Output is correct
10 Correct 34 ms 30032 KB Output is correct
11 Correct 34 ms 30300 KB Output is correct
12 Correct 33 ms 31572 KB Output is correct
13 Correct 33 ms 31404 KB Output is correct
14 Correct 32 ms 31060 KB Output is correct
15 Correct 31 ms 31876 KB Output is correct
16 Correct 30 ms 32336 KB Output is correct
17 Correct 33 ms 32336 KB Output is correct
18 Correct 34 ms 32860 KB Output is correct
19 Correct 35 ms 36124 KB Output is correct
20 Correct 37 ms 35900 KB Output is correct
21 Correct 46 ms 35668 KB Output is correct
22 Correct 1 ms 10588 KB Output is correct
23 Correct 1 ms 10588 KB Output is correct
24 Correct 1 ms 10588 KB Output is correct
25 Correct 1 ms 10588 KB Output is correct
26 Correct 1 ms 10588 KB Output is correct
27 Correct 1 ms 10588 KB Output is correct
28 Correct 1 ms 10588 KB Output is correct
29 Correct 2 ms 10844 KB Output is correct
30 Correct 2 ms 10844 KB Output is correct
31 Correct 161 ms 102332 KB Output is correct
32 Correct 131 ms 102336 KB Output is correct
33 Correct 246 ms 102224 KB Output is correct
34 Correct 235 ms 102224 KB Output is correct
35 Correct 227 ms 102468 KB Output is correct
36 Correct 116 ms 102224 KB Output is correct
37 Correct 124 ms 102228 KB Output is correct
38 Correct 136 ms 102224 KB Output is correct
39 Correct 120 ms 102480 KB Output is correct
40 Correct 118 ms 102480 KB Output is correct
41 Correct 140 ms 102484 KB Output is correct
42 Correct 169 ms 102484 KB Output is correct
43 Correct 124 ms 102480 KB Output is correct
44 Correct 120 ms 102484 KB Output is correct
45 Correct 127 ms 102484 KB Output is correct
46 Correct 125 ms 102480 KB Output is correct
47 Correct 138 ms 102436 KB Output is correct
48 Correct 121 ms 102740 KB Output is correct
49 Correct 127 ms 102796 KB Output is correct
50 Correct 125 ms 102660 KB Output is correct
51 Execution timed out 2058 ms 191312 KB Time limit exceeded
52 Halted 0 ms 0 KB -