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답안 #710301

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
710301 2023-03-15T06:52:39 Z lam 철인 이종 경기 (APIO18_duathlon) C++14
0 / 100
 1000 ms 1048576 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 1e5 + 10;
int n,m;
vector <int> adj[maxn];
int dp[maxn],dp2[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);
//    cout<<x<<" :: "<<val<<' '<<temp<<endl;
    if (temp>0&&val>0)
    ans += val*temp;
    for (int i:adj[x])
        if (i!=p)
    {
        dfs3(i,x,sz);
        val = dp[i]+s[i];
        temp = sz - 1 - val;
//        cout<<i<<" "<<x<<" :: "<<val<<" :: "<<temp<<endl;
        if (temp>0&&val>0) ans+=val*temp;
    }
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
//    freopen("dualthon.inp","r",stdin);
//    freopen("dualthon.out","w",stdout);
    cin>>n>>m;
    for (int i=1; i<=m; i++)
    {
        int u,v; cin>>u>>v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    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:34:20: 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]
   34 |     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 Runtime error 553 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 553 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1074 ms 425156 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 91 ms 8068 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 105 ms 8088 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 553 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 553 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -