oj.uz

답안 #298482

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
298482 2020-09-13T02:01:42 Z XmtosX Election Campaign (JOI15_election_campaign) C++17
10 / 100
 601 ms 44268 KB 
#include <bits/stdc++.h>
using namespace std;
const int N=1e5+3;
int n,q,sprs[N][20],lvl[N],dpsons[N],dp[N],par[N],sz[N],l,r;
vector <int> v[N],pfx[N][2];
vector <pair<int,int> > chn[N];
bool yes,yes1;
struct node
{
    int a,b,upa,upb,ans;
};
vector <node> V[N];
int findpar(int x)
{
    if (x==par[x])
        return x;
    return par[x]=findpar(par[x]);
}
void unun (int n1,int n2)
{
    int x1=findpar(n1);
    int x2=findpar(n2);
    par[x2]=x1;
}
void dfs1 (int x,int p)
{
    sz[x]=1;
    par[x]=x;
    sprs[x][0]=p;
    lvl[x]=lvl[p]+1;
    pair<int,int> big={0,0};
    for (int i=1;i<20;i++)
        sprs[x][i]=sprs[sprs[x][i-1]][i-1];
    for (int i=0;i<v[x].size();i++)
    {
        if (v[x][i]!=p)
        {
            dfs1(v[x][i],x);
            sz[x]+=sz[v[x][i]];
            big=max(big,make_pair(sz[v[x][i]],v[x][i]));
        }
    }
    if (big.first)
        unun(x,big.second);
}
int query (int x,int idx)
{
    if (chn[x].empty())
        return 0;
    int ans=0;
    int low=0,high=chn[x].size()-1,mid,idx1,idx2;
    while (low<=high)
    {
        mid= (low+high)/2;
        if (chn[x][mid].first>l)
            low=mid+1;
        else
        {
            idx1=mid;
            high=mid-1;
        }
    }
    low=0,high=chn[x].size()-1;
    while (low<=high)
    {
        mid= (low+high)/2;
        if (chn[x][mid].first<r)
            high=mid-1;
        else
        {
            idx2=mid;
            low=mid+1;
        }
    }
    ans=pfx[x][idx][idx2];
    idx1--;
    if (idx1>=0)
        ans-=pfx[x][idx][idx1];
    if (chn[x].back().first>r)
    {
        ans+= query(findpar(sprs[x][0]),idx);
    }
    return ans;
}
void dfs (int x,int p)
{
    for (int i=0;i<v[x].size();i++)
    {
        if (v[x][i]!=p)
        {
            dfs(v[x][i],x);
            dpsons[x]+=dp[v[x][i]];
        }
    }

    dp[x]=dpsons[x];
    int maxx=dpsons[x];
    for (int i=0;i<V[x].size();i++)
    {
        int cur=dpsons[x];
        cur-= dp[V[x][i].upa];
        cur-= dp[V[x][i].upb];
        cur+= dpsons[V[x][i].a];
        cur+= dpsons[V[x][i].b];
        int A= V[x][i].a;
        int B= V[x][i].b;
        if (x!=V[x][i].a&&sprs[V[x][i].a][0]!=x)
        {
            V[x][i].a=sprs[V[x][i].a][0];
            l= lvl[V[x][i].a];
            r= max(lvl[V[x][i].upa],lvl[x]+1);
            cur+= query(findpar(V[x][i].a),0);
            r++;
            cur-= dp[A];
            if (l>=r)
                cur-= (query(findpar(V[x][i].a),1));
        }
        if (x!=V[x][i].b&&sprs[V[x][i].b][0]!=x)
        {
            V[x][i].b=sprs[V[x][i].b][0];
            l= lvl[V[x][i].b];
            r= max(lvl[V[x][i].upb],lvl[x]+1);
            cur+= query(findpar(V[x][i].b),0);
            r++;
            cur-= dp[B];
            if (l>=r)
            {
                cur-= (query(findpar(V[x][i].b),1));
            }
        }
        cur+= V[x][i].ans;
        maxx=max(maxx,cur);
    }
    dp[x]=maxx;
    int idx=findpar(x);
    pair<int,int> P= {lvl[x],x};
    int o;
    if (!chn[idx].empty())
        o=chn[idx].back().second;
    chn[idx].push_back(P);
    if (pfx[idx][0].empty())
    {
        pfx[idx][0].push_back(dpsons[x]);
        pfx[idx][1].push_back(dp[x]);
    }
    else
    {
        pfx[idx][0].push_back(pfx[idx][0].back());
        pfx[idx][0].back()+= dpsons[x];
        pfx[idx][1].push_back(pfx[idx][1].back());
        pfx[idx][1].back()+= dp[x];
    }
}
pair<int,int> lca(int x,int y)
{
    pair<int,int> p;
    if (lvl[x]<lvl[y])
        swap(x,y);
    for (int i=19;i>=0;i--)
    {
        if (lvl[sprs[x][i]]>lvl[y])
            x=sprs[x][i];
    }
    if (sprs[x][0]==y)
    {
        p={x,y};
        return p;
    }
    if (lvl[x]!=lvl[y])
        x=sprs[x][0];
    for (int i=19;i>=0;i--)
    {
        if (sprs[x][i]!=sprs[y][i])
        {
            x=sprs[x][i];
            y=sprs[y][i];
        }
    }
    p={x,y};
    return p;
}
int main()
{
    int maxx=0;
    cin >>n;
    for (int i=0;i<n-1;i++)
    {
        int a,b;
        cin >>a>>b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    int st=1;
    dfs1(st,0);
    cin >>q;
    while(q--)
    {
        int x,y,z;
        cin >>x>>y>>z;
        pair<int,int> p=lca(x,y);
        int lc= sprs[p.first][0];
        int val=z;
        node A= {x,y,p.first,p.second,val};
        maxx=max(maxx,z);
        V[lc].push_back(A);
    }
    dfs(st,0);
    cout <<dp[st];
    return 0;
}
/*
7
3 4
6 5
2 7
1 5
7 5
4 5
5
4 3 10
5 6 5
2 6 9
7 2 2
1 3 8

8
1 2
2 3
3 4
4 5
5 6
6 7
7 8
5
7 5 4
5 8 9
4 3 9
1 3 3
2 8 11

20
17 10
11 4
8 3
3 16
1 14
15 18
5 4
6 18
10 18
19 4
16 7
2 13
4 12
12 20
9 20
18 13
20 14
14 7
13 7
15
19 9 2341
13 8 6974
8 3 3339
15 17 6515
10 13 4370
1 7 8376
18 2 9272
6 7 4595
1 20 505
10 9 308
6 19 8937
2 15 5072
5 4 4217
2 4 4170
19 12 8204
*/

Compilation message

election_campaign.cpp: In function 'void dfs1(int, int)':
election_campaign.cpp:34:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for (int i=0;i<v[x].size();i++)
      |                  ~^~~~~~~~~~~~
election_campaign.cpp: In function 'void dfs(int, int)':
election_campaign.cpp:87:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |     for (int i=0;i<v[x].size();i++)
      |                  ~^~~~~~~~~~~~
election_campaign.cpp:98:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |     for (int i=0;i<V[x].size();i++)
      |                  ~^~~~~~~~~~~~
election_campaign.cpp:137:9: warning: variable 'o' set but not used [-Wunused-but-set-variable]
  137 |     int o;
      |         ^
election_campaign.cpp: In function 'int query(int, int)':
election_campaign.cpp:76:9: warning: 'idx1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   76 |     idx1--;
      |     ~~~~^~
election_campaign.cpp:75:25: warning: 'idx2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   75 |     ans=pfx[x][idx][idx2];
      |                         ^

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12032 KB Output is correct
2 Correct 8 ms 12160 KB Output is correct
3 Correct 8 ms 12032 KB Output is correct
4 Correct 10 ms 12288 KB Output is correct
5 Incorrect 254 ms 31480 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12032 KB Output is correct
2 Correct 8 ms 12032 KB Output is correct
3 Correct 9 ms 12416 KB Output is correct
4 Correct 433 ms 44268 KB Output is correct
5 Correct 419 ms 44264 KB Output is correct
6 Correct 376 ms 44268 KB Output is correct
7 Correct 430 ms 44264 KB Output is correct
8 Correct 431 ms 44140 KB Output is correct
9 Correct 382 ms 44144 KB Output is correct
10 Correct 416 ms 44248 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12032 KB Output is correct
2 Correct 8 ms 12032 KB Output is correct
3 Correct 9 ms 12416 KB Output is correct
4 Correct 433 ms 44268 KB Output is correct
5 Correct 419 ms 44264 KB Output is correct
6 Correct 376 ms 44268 KB Output is correct
7 Correct 430 ms 44264 KB Output is correct
8 Correct 431 ms 44140 KB Output is correct
9 Correct 382 ms 44144 KB Output is correct
10 Correct 416 ms 44248 KB Output is correct
11 Correct 51 ms 13176 KB Output is correct
12 Correct 515 ms 44268 KB Output is correct
13 Correct 453 ms 44268 KB Output is correct
14 Correct 413 ms 44140 KB Output is correct
15 Correct 477 ms 44140 KB Output is correct
16 Correct 402 ms 44140 KB Output is correct
17 Correct 439 ms 44140 KB Output is correct
18 Correct 438 ms 44136 KB Output is correct
19 Correct 404 ms 44140 KB Output is correct
20 Correct 439 ms 44136 KB Output is correct

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 601 ms 32520 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12032 KB Output is correct
2 Correct 8 ms 12160 KB Output is correct
3 Correct 8 ms 12032 KB Output is correct
4 Correct 10 ms 12288 KB Output is correct
5 Incorrect 254 ms 31480 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12032 KB Output is correct
2 Correct 8 ms 12160 KB Output is correct
3 Correct 8 ms 12032 KB Output is correct
4 Correct 10 ms 12288 KB Output is correct
5 Incorrect 254 ms 31480 KB Output isn't correct
6 Halted 0 ms 0 KB -