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답안 #710342

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
710342 2023-03-15T07:30:53 Z lam 철인 이종 경기 (APIO18_duathlon) C++14
23 / 100
 126 ms 39540 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 1e5 + 10;
int n,m;
vector <int> adj[maxn],adj2[maxn];
int dp[maxn],dp2[maxn];
stack <int> st;
int l[maxn],t[maxn],cnt2;
int scc, id[maxn], s[maxn];
bool dau[maxn];
vector <int> root;
int ans = 0LL;
void dfs(int x, int p)
{
    dau[x] = 1;
    dp[x] = 0;
    for (int i:adj[x])
        if (i!=p)
    {
        dfs(i,x);
        dp[x] += dp[i]+1;
    }
}

void dfs2(int x, int p, int val)
{
    dp2[x] = val;
    val++;
    vector <int> pre,suf;
    for (int i:adj[x])
        if (i!=p)
    {
        pre.push_back(dp[i]+1);
        suf.push_back(dp[i]+1);
    }
    for (int i=1; i<pre.size(); i++) pre[i]+=pre[i-1];
    for (int i=suf.size()-2; i>=0; i--) suf[i]+=suf[i+1];
    int cnt=0;
    for (int i:adj[x])
        if (i!=p)
    {
        int val2 = val;
        if (cnt>0) val2 += pre[cnt-1];
        if (cnt<(int)suf.size()-1) val2+=suf[cnt+1];
        cnt++;
        dfs2(i,x,val2);
    }
}

void dfs3(int x, int p, int sz)
{
    int val = dp2[x];
    int temp = (sz - 1 - val);
    if (temp>0&&val>0)
    ans += val*temp;
    for (int i:adj[x])
        if (i!=p)
    {
        dfs3(i,x,sz);
        val = dp[i]+1;
        temp = sz - 1 - val;
        if (temp>0&&val>0) ans+=val*temp;
    }
}

void build(int x, int p)
{
    st.push(x);
    l[x]=t[x]=++cnt2;
    for (int i:adj2[x])
        if (i!=p)
    {
        if (t[i]==0)
        {
            build(i,x);
            l[x]=min(l[x],l[i]);
        }
        else l[x]=min(l[x],t[i]);
    }
    if (l[x]==t[x])
    {
        scc++; int temp;
        do
        {
            temp = st.top(); st.pop();
            s[scc] ++ ;
            id[temp] = scc;
        }
        while (temp!=x);
    }
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    cin>>n>>m;
    for (int i=1; i<=m; i++)
    {
        int u,v; cin>>u>>v;
        adj2[u].push_back(v);
        adj2[v].push_back(u);
    }
    scc=cnt2=0;
    for (int i=1; i<=n; i++) if (!t[i]) build(i,i);
    for (int i=1; i<=n; i++)
        for (int j:adj2[i])
            if (id[i]!=id[j])
                adj[id[i]].push_back(id[j]);
    n = scc;
    fill_n(dau,n+1,0);
    for (int i=1; i<=n; i++) if (!dau[i]) dfs(i,i), root.push_back(i);
    for (int i:root) dfs2(i,i,0);
    for (int i:root) dfs3(i,i,dp[i]+1);
    cout<<ans<<'\n';
}

Compilation message

count_triplets.cpp: In function 'void dfs2(long long int, long long int, long long int)':
count_triplets.cpp:37:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for (int i=1; i<pre.size(); i++) pre[i]+=pre[i-1];
      |                   ~^~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 4948 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 4948 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 57 ms 17568 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5184 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5332 KB Output is correct
5 Correct 5 ms 5204 KB Output is correct
6 Correct 4 ms 5320 KB Output is correct
7 Correct 5 ms 5364 KB Output is correct
8 Correct 5 ms 5204 KB Output is correct
9 Correct 3 ms 5204 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 3 ms 5076 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5076 KB Output is correct
15 Correct 3 ms 5076 KB Output is correct
16 Correct 3 ms 5076 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 3 ms 5204 KB Output is correct
19 Correct 3 ms 5116 KB Output is correct
20 Correct 4 ms 5204 KB Output is correct

Subtask #5
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 102 ms 17216 KB Output is correct
2 Correct 113 ms 17356 KB Output is correct
3 Correct 84 ms 17304 KB Output is correct
4 Correct 82 ms 17228 KB Output is correct
5 Correct 87 ms 17228 KB Output is correct
6 Correct 126 ms 39540 KB Output is correct
7 Correct 123 ms 25360 KB Output is correct
8 Correct 118 ms 23308 KB Output is correct
9 Correct 99 ms 21140 KB Output is correct
10 Correct 93 ms 17284 KB Output is correct
11 Correct 105 ms 17228 KB Output is correct
12 Correct 82 ms 17272 KB Output is correct
13 Correct 85 ms 17228 KB Output is correct
14 Correct 70 ms 16972 KB Output is correct
15 Correct 94 ms 16552 KB Output is correct
16 Correct 61 ms 15076 KB Output is correct
17 Correct 50 ms 19248 KB Output is correct
18 Correct 61 ms 19784 KB Output is correct
19 Correct 62 ms 20244 KB Output is correct
20 Correct 58 ms 19172 KB Output is correct

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Incorrect 3 ms 5076 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 90 ms 17208 KB Output is correct
2 Correct 96 ms 17004 KB Output is correct
3 Incorrect 98 ms 15208 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 4948 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 4948 KB Output isn't correct
2 Halted 0 ms 0 KB -