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Submission #261637

# Submission time Handle Problem Language Result Execution time Memory
261637 2020-08-11T23:20:48 Z Rouge_Hugo Duathlon (APIO18_duathlon) C++14
23 / 100
 190 ms 29048 KB 
#include<bits/stdc++.h>
#define fi first
#define ll long long
using namespace std;
int n,m;
ll re=0;
int szz=0;
const int N=200009;
vector<pair<int,int>>v[N];
vector<int>v1[N];
ll cnt=1,t[N],num[N],low[N],bridge[N],b[N],par[N],vis[N],sz[N],bo[N];
pair<int,int>a[N];
int tt=0;
void dfs (int x,int p)
{
    vis[x]=1;
    low[x]=num[x]=++tt;
    for(auto it:v[x])
    {
        if (num[it.first]==0)
            dfs(it.first,x);
        if (num[x]<low[it.first])
            bridge[it.second]=1;
        if (it.first!=p)
            low[x]=min(low[x],low[it.first]);
    }
}
void dfs1(int x,int p)
{
    vis[x]=1;
    par[x]=cnt;
    szz++;
    for(auto it:v[x])
    {
        if(it.fi==p)continue;
        if (!vis[it.first]&&bridge[it.second]==0)
        {
            dfs1(it.first,x);
        }
    }
}
void dfs2(int x,int p)
{
    vis[x]=1;
    for(auto it:v[x])
    {
        if(it.fi==p)continue;
        if (!vis[it.first])
            dfs2(it.first,x);
        if (bridge[it.second]==1)
        {
            v1[par[x]].push_back(par[it.first]);
            v1[par[it.first]].push_back(par[x]);
        }
    }
}
void solve(int x,int p)
{
    vis[x]=1;
    for(auto it:v1[x])
    {
        if(it==p)continue;
        solve(it,x);
        sz[x]+=sz[it];
    }
    sz[x]+=bo[x];
}
void go (int x,int p,ll up)
{
    vis[x]=1;
    sz[x]-=bo[x];
    if(bo[x]>=3)
        re+=bo[x]*(bo[x]-1)*(bo[x]-2);
    re+=2*up*bo[x]*sz[x];
    if(bo[x]>2)
    {
        re+=(up)*((bo[x])-1)*((bo[x])-1)*2;
        re+=(sz[x])*(bo[x]-1)*(bo[x]-1)*2;
    }
    for(auto it:v1[x])
    {
        if(it==p)continue;
        re+=2*t[x]*sz[it]*bo[x];
        t[x]+=sz[it];
        go(it,x,up+bo[x]+sz[x]-sz[it]);
    }
}
int main()
{
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    scanf("%d %d", &n, &m);
    int x,y;
    for(int i=0; i<m; i++)
    {
        scanf("%d %d", &x, &y);
        a[i]= {x,y};
        v[x].push_back({y,i});
        v[y].push_back({x,i});
    }
    memset (vis,0,sizeof vis);
    for(int i=1;i<n+1;i++)
    {
        if(vis[i])continue;
        dfs(i,-1);
    }
    memset (vis,0,sizeof vis);
    for(int i=1; i<n+1; i++)
    {
        szz=0;
        if (!vis[i])
        {
            szz=0;
            dfs1(i,-1);
            bo[i]=szz;
            cnt++;
        }
    }
    memset (vis,0,sizeof vis);
    for(int i=1;i<n+1;i++)
    {
        if(vis[i])continue;
        dfs2(i,-1);
    }
    memset (vis,0,sizeof vis);
    for(int i=1;i<cnt;i++)
    {
        if(vis[i])continue;
        solve(i,0);
    }
    re=0;
    memset (vis,0,sizeof vis);
    for(int i=1;i<cnt;i++)
    {
        if(vis[i])continue;
        go(i,0,0);
    }
    cout<<re;
}

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:91:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
count_triplets.cpp:95:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11392 KB Output is correct
2 Correct 8 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11392 KB Output is correct
5 Correct 8 ms 11392 KB Output is correct
6 Correct 8 ms 11392 KB Output is correct
7 Incorrect 8 ms 11392 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11392 KB Output is correct
2 Correct 8 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11392 KB Output is correct
5 Correct 8 ms 11392 KB Output is correct
6 Correct 8 ms 11392 KB Output is correct
7 Incorrect 8 ms 11392 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 27144 KB Output is correct
2 Correct 121 ms 27000 KB Output is correct
3 Incorrect 126 ms 26236 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11520 KB Output is correct
2 Correct 9 ms 11520 KB Output is correct
3 Correct 8 ms 11520 KB Output is correct
4 Correct 8 ms 11520 KB Output is correct
5 Correct 8 ms 11520 KB Output is correct
6 Correct 9 ms 11520 KB Output is correct
7 Correct 9 ms 11520 KB Output is correct
8 Correct 9 ms 11520 KB Output is correct
9 Correct 8 ms 11520 KB Output is correct
10 Correct 9 ms 11520 KB Output is correct
11 Correct 8 ms 11520 KB Output is correct
12 Correct 8 ms 11520 KB Output is correct
13 Correct 9 ms 11520 KB Output is correct
14 Correct 10 ms 11648 KB Output is correct
15 Correct 8 ms 11520 KB Output is correct
16 Correct 8 ms 11520 KB Output is correct
17 Correct 8 ms 11520 KB Output is correct
18 Correct 8 ms 11520 KB Output is correct
19 Correct 8 ms 11520 KB Output is correct
20 Correct 8 ms 11520 KB Output is correct

Subtask #5
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 139 ms 24776 KB Output is correct
2 Correct 138 ms 24612 KB Output is correct
3 Correct 140 ms 24696 KB Output is correct
4 Correct 140 ms 24696 KB Output is correct
5 Correct 142 ms 24636 KB Output is correct
6 Correct 148 ms 29048 KB Output is correct
7 Correct 157 ms 27768 KB Output is correct
8 Correct 174 ms 27000 KB Output is correct
9 Correct 190 ms 26080 KB Output is correct
10 Correct 154 ms 24696 KB Output is correct
11 Correct 172 ms 24584 KB Output is correct
12 Correct 150 ms 24696 KB Output is correct
13 Correct 149 ms 24696 KB Output is correct
14 Correct 145 ms 24184 KB Output is correct
15 Correct 125 ms 23672 KB Output is correct
16 Correct 84 ms 21624 KB Output is correct
17 Correct 91 ms 24300 KB Output is correct
18 Correct 94 ms 24296 KB Output is correct
19 Correct 97 ms 24540 KB Output is correct
20 Correct 95 ms 24424 KB Output is correct

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11520 KB Output is correct
2 Correct 9 ms 11520 KB Output is correct
3 Incorrect 9 ms 11520 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 141 ms 24736 KB Output is correct
2 Correct 160 ms 24416 KB Output is correct
3 Incorrect 152 ms 23416 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11392 KB Output is correct
2 Correct 8 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11392 KB Output is correct
5 Correct 8 ms 11392 KB Output is correct
6 Correct 8 ms 11392 KB Output is correct
7 Incorrect 8 ms 11392 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11392 KB Output is correct
2 Correct 8 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11392 KB Output is correct
5 Correct 8 ms 11392 KB Output is correct
6 Correct 8 ms 11392 KB Output is correct
7 Incorrect 8 ms 11392 KB Output isn't correct
8 Halted 0 ms 0 KB -