oj.uz

답안 #364566

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
364566 2021-02-09T13:24:42 Z eric_xiao 공장들 (JOI14_factories) C++14
33 / 100
 8000 ms 274032 KB 
#include<bits/stdc++.h>
#include "factories.h"
#define ll long long
#define pii pair<ll,ll>
#define ff first
#define ss second
using namespace std;
int pre[500009],td[500009],fst[500009];
ll dep[500009],inv[500009];
int st[22][1500009],cnt = 0;
vector<int> G[500009],d[500009];
vector<int> G2[500009];
vector<ll> d2[500009];
vector<int> ov;
void DFS(int u,int p)
{
    cnt++;
    pre[u] = cnt;
    inv[pre[u]] = u;
    fst[u] = ov.size();
    ov.push_back(pre[u]);
    for(int i = 0;i < G[u].size();i++)
    {
        int v = G[u][i];
        if(v == p) continue;
        dep[v] = dep[u] + d[u][i];
        td[v] = td[u] + 1;
        DFS(v,u);
        ov.push_back(pre[u]);
    }
}
int LCA(int a,int b)
{
    if(a == b) return a;
    if(a == 0 || b == 0) return 0LL;
    if(fst[a] > fst[b]) swap(a,b);
    int ret;
    int tp = __lg(fst[b]-fst[a]);
    //cout << fst[a] << " " << fst[b] << " " << tp << " " << min(st[tp][fst[a]],st[tp][fst[b] - (1<<tp)]) << endl;
    return inv[min(st[tp][fst[a]],st[tp][fst[b] - (1<<tp)])];
//    ret = min()
}
const bool cmp(const int &a,const int & b)
{
    return pre[a] < pre[b];
}
void Init(int N, int A[], int B[], int D[]) {
    for(int i = 0;i < N-1;i++)
    {
        A[i]++;
        B[i]++;
        G[A[i]].push_back(B[i]);
        G[B[i]].push_back(A[i]);
        d[A[i]].push_back(D[i]);
        d[B[i]].push_back(D[i]);
    }
    td[1] = 1;
    ov.push_back(0);
    DFS(1,0);
    for(int i = 0;i < ov.size();i++)
    {
        st[0][i] = ov[i];
 
    }
    for(int i = 1;i < 22;i++)
    {
        for(int j = 0;j+(1<<(i-1)) < ov.size();j++)
        {
            st[i][j] = min(st[i-1][j],st[i-1][j+(1<<(i-1))]);
            //cout << st[i][j] << " ";
        }
        //cout << endl;
    }
 
}
vector<ll> vs;
int temp[500009];
int stk[500009];
ll ans = 10000000000000000;
int s,x[500009],t,y[500009];
void add_edge(int a,int b)
{
    ll tp = abs(dep[a]-dep[b]);
    //cerr << a << "_" << b << "_" << tp << endl;
    G2[a].push_back(b);
    G2[b].push_back(a);
    d2[a].push_back(tp);
    d2[b].push_back(tp);
}
ll iss[500009],ist[500009];
ll dp1[500009],dp2[500009];
set<int> used;
void DFS2(int u,int p)
{
    if(iss[u]) dp1[u] = 0;
    if(ist[u]) dp2[u] = 0;
    for(int i = 0;i < G2[u].size();i++)
    {
        int v = G2[u][i];
        if(v == p) continue;
        DFS2(v,u);
        dp1[u] = min(dp1[v]+d2[u][i],dp1[u]);
        dp2[u] = min(dp2[v]+d2[u][i],dp2[u]);
    }
    //cout << u << "_" << dp1[u] << "_" << dp2[u] << endl;
    ans = min(ans,dp1[u] + dp2[u]);
 
}
void DKS()
{
    int i;
    for(i = 0;i < s;i++)
    {
        iss[x[i]] = 1;
    }
    for(i = 0;i < t;i++)
    {
        ist[y[i]] = 1;
    }
    for(auto tt : used)
    {
        dp1[tt] = dp2[tt] = 10000000000000000;
    }
    DFS2(x[0],0);
    for(i = 0;i < s;i++)
    {
        iss[x[i]] = 0;
    }
    for(i = 0;i < t;i++)
    {
        ist[y[i]] = 0;
    }
 
}
long long Query(int S, int X[], int T, int Y[]) {
    vs.clear();
    s = S;
    used.clear();
    for(int i = 0;i < S;i++)
    {
        X[i]++;
        used.insert(X[i]);
        x[i] = X[i];
        G2[X[i]].clear();
        d2[X[i]].clear();
        temp[X[i]] = 1;
        vs.push_back(X[i]);
    }
    int fg = 0;
    t = T;
    for(int i = 0;i < T;i++)
    {
        Y[i]++;
        used.insert(Y[i]);
        y[i] = Y[i];
        G2[Y[i]].clear();
        d2[Y[i]].clear();
        vs.push_back(Y[i]);
        if(temp[Y[i]] == 1) fg = 1;
    }
    for(int i = 0;i < S;i++) temp[X[i]] = 0;
    if(fg == 1) return 0;
    sort(vs.begin(),vs.end(),cmp);
    stk[0] = 0;
    int sz = 1;
    ans = 10000000000000000;
    for(int i = 0;i < vs.size();i++)
    {
        ll u = vs[i];
        ll p = LCA(u,stk[sz-1]);
        //cerr << vs[i] << " p = " << p << endl;
        if(!used.count(p))
        {
            used.insert(p);
            G2[p].clear();
            d2[p].clear();
        }
        if(p == stk[sz-1]) stk[sz++] = u;
        else
        {
            while(sz > 1 && td[stk[sz-2]] >= td[p])
            {
                add_edge(stk[sz-1],stk[sz-2]);
                sz--;
            }
            if(stk[sz-1] != p)
            {
                add_edge(stk[sz-1],p);
                stk[sz-1] = p;
            }
            stk[sz++] = u;
        }
    }
    for (int i = 1; i < sz - 1; ++i) add_edge(stk[i], stk[i + 1]);
    DKS();
    return ans;
}

Compilation message

factories.cpp: In function 'void DFS(int, int)':
factories.cpp:22:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for(int i = 0;i < G[u].size();i++)
      |                   ~~^~~~~~~~~~~~~
factories.cpp: In function 'int LCA(int, int)':
factories.cpp:37:9: warning: unused variable 'ret' [-Wunused-variable]
   37 |     int ret;
      |         ^~~
factories.cpp: In function 'void Init(int, int*, int*, int*)':
factories.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |     for(int i = 0;i < ov.size();i++)
      |                   ~~^~~~~~~~~~~
factories.cpp:67:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         for(int j = 0;j+(1<<(i-1)) < ov.size();j++)
      |                       ~~~~~~~~~~~~~^~~~~~~~~~~
factories.cpp: In function 'void DFS2(int, int)':
factories.cpp:97:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |     for(int i = 0;i < G2[u].size();i++)
      |                   ~~^~~~~~~~~~~~~~
factories.cpp: In function 'long long int Query(int, int*, int, int*)':
factories.cpp:167:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  167 |     for(int i = 0;i < vs.size();i++)
      |                   ~~^~~~~~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 62 ms 48108 KB Output is correct
2 Correct 1559 ms 59120 KB Output is correct
3 Correct 1574 ms 59264 KB Output is correct
4 Correct 1595 ms 59168 KB Output is correct
5 Correct 1330 ms 59536 KB Output is correct
6 Correct 1130 ms 59116 KB Output is correct
7 Correct 1601 ms 58860 KB Output is correct
8 Correct 1579 ms 59024 KB Output is correct
9 Correct 1330 ms 59184 KB Output is correct
10 Correct 1120 ms 58912 KB Output is correct
11 Correct 1567 ms 58600 KB Output is correct

Subtask #2
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 38 ms 47724 KB Output is correct
2 Correct 2515 ms 234772 KB Output is correct
3 Correct 2706 ms 238452 KB Output is correct
4 Correct 1996 ms 237140 KB Output is correct
5 Correct 2458 ms 274032 KB Output is correct
6 Correct 2886 ms 239400 KB Output is correct
7 Correct 2926 ms 93928 KB Output is correct
8 Correct 1799 ms 94680 KB Output is correct
9 Correct 1967 ms 99320 KB Output is correct
10 Correct 2685 ms 95340 KB Output is correct

Subtask #3
0 / 67.0

# 결과 실행 시간 메모리 Grader output
1 Correct 62 ms 48108 KB Output is correct
2 Correct 1559 ms 59120 KB Output is correct
3 Correct 1574 ms 59264 KB Output is correct
4 Correct 1595 ms 59168 KB Output is correct
5 Correct 1330 ms 59536 KB Output is correct
6 Correct 1130 ms 59116 KB Output is correct
7 Correct 1601 ms 58860 KB Output is correct
8 Correct 1579 ms 59024 KB Output is correct
9 Correct 1330 ms 59184 KB Output is correct
10 Correct 1120 ms 58912 KB Output is correct
11 Correct 1567 ms 58600 KB Output is correct
12 Correct 38 ms 47724 KB Output is correct
13 Correct 2515 ms 234772 KB Output is correct
14 Correct 2706 ms 238452 KB Output is correct
15 Correct 1996 ms 237140 KB Output is correct
16 Correct 2458 ms 274032 KB Output is correct
17 Correct 2886 ms 239400 KB Output is correct
18 Correct 2926 ms 93928 KB Output is correct
19 Correct 1799 ms 94680 KB Output is correct
20 Correct 1967 ms 99320 KB Output is correct
21 Correct 2685 ms 95340 KB Output is correct
22 Correct 7488 ms 249116 KB Output is correct
23 Correct 5580 ms 247696 KB Output is correct
24 Execution timed out 8082 ms 253208 KB Time limit exceeded
25 Halted 0 ms 0 KB -