oj.uz

답안 #298484

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
298484 2020-09-13T02:05:06 Z XmtosX Election Campaign (JOI15_election_campaign) C++17
10 / 100
 597 ms 44396 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= 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= 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 9 ms 12032 KB Output is correct
3 Correct 8 ms 12160 KB Output is correct
4 Correct 9 ms 12288 KB Output is correct
5 Incorrect 247 ms 30336 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 7 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 422 ms 44140 KB Output is correct
5 Correct 418 ms 44140 KB Output is correct
6 Correct 389 ms 44268 KB Output is correct
7 Correct 437 ms 44392 KB Output is correct
8 Correct 415 ms 44140 KB Output is correct
9 Correct 399 ms 44140 KB Output is correct
10 Correct 418 ms 44140 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 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 422 ms 44140 KB Output is correct
5 Correct 418 ms 44140 KB Output is correct
6 Correct 389 ms 44268 KB Output is correct
7 Correct 437 ms 44392 KB Output is correct
8 Correct 415 ms 44140 KB Output is correct
9 Correct 399 ms 44140 KB Output is correct
10 Correct 418 ms 44140 KB Output is correct
11 Correct 49 ms 13176 KB Output is correct
12 Correct 475 ms 44136 KB Output is correct
13 Correct 444 ms 44140 KB Output is correct
14 Correct 410 ms 44292 KB Output is correct
15 Correct 461 ms 44300 KB Output is correct
16 Correct 410 ms 44140 KB Output is correct
17 Correct 444 ms 44396 KB Output is correct
18 Correct 448 ms 44248 KB Output is correct
19 Correct 404 ms 44268 KB Output is correct
20 Correct 465 ms 44136 KB Output is correct

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 597 ms 32696 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 9 ms 12032 KB Output is correct
3 Correct 8 ms 12160 KB Output is correct
4 Correct 9 ms 12288 KB Output is correct
5 Incorrect 247 ms 30336 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 9 ms 12032 KB Output is correct
3 Correct 8 ms 12160 KB Output is correct
4 Correct 9 ms 12288 KB Output is correct
5 Incorrect 247 ms 30336 KB Output isn't correct
6 Halted 0 ms 0 KB -