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Submission #261639

# Submission time Handle Problem Language Result Execution time Memory
261639 2020-08-11T23:23:22 Z Rouge_Hugo Duathlon (APIO18_duathlon) C++14
23 / 100
 198 ms 28920 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 Incorrect 8 ms 11392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 11392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 122 ms 27000 KB Output isn't correct
2 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 9 ms 11520 KB Output is correct
4 Correct 9 ms 11520 KB Output is correct
5 Correct 9 ms 11520 KB Output is correct
6 Correct 9 ms 11648 KB Output is correct
7 Correct 9 ms 11520 KB Output is correct
8 Correct 9 ms 11520 KB Output is correct
9 Correct 9 ms 11520 KB Output is correct
10 Correct 9 ms 11520 KB Output is correct
11 Correct 9 ms 11520 KB Output is correct
12 Correct 9 ms 11520 KB Output is correct
13 Correct 9 ms 11520 KB Output is correct
14 Correct 9 ms 11520 KB Output is correct
15 Correct 9 ms 11520 KB Output is correct
16 Correct 9 ms 11392 KB Output is correct
17 Correct 8 ms 11520 KB Output is correct
18 Correct 9 ms 11520 KB Output is correct
19 Correct 11 ms 11520 KB Output is correct
20 Correct 10 ms 11520 KB Output is correct

Subtask #5
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 157 ms 24568 KB Output is correct
2 Correct 192 ms 24696 KB Output is correct
3 Correct 157 ms 24760 KB Output is correct
4 Correct 155 ms 24700 KB Output is correct
5 Correct 155 ms 24568 KB Output is correct
6 Correct 165 ms 28920 KB Output is correct
7 Correct 182 ms 27708 KB Output is correct
8 Correct 177 ms 26872 KB Output is correct
9 Correct 198 ms 25976 KB Output is correct
10 Correct 153 ms 24568 KB Output is correct
11 Correct 137 ms 24568 KB Output is correct
12 Correct 140 ms 24568 KB Output is correct
13 Correct 140 ms 24572 KB Output is correct
14 Correct 132 ms 24056 KB Output is correct
15 Correct 116 ms 23568 KB Output is correct
16 Correct 78 ms 21752 KB Output is correct
17 Correct 87 ms 24316 KB Output is correct
18 Correct 102 ms 24296 KB Output is correct
19 Correct 94 ms 24420 KB Output is correct
20 Correct 117 ms 24376 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 161 ms 24568 KB Output is correct
2 Correct 156 ms 24440 KB Output is correct
3 Incorrect 161 ms 23288 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 11392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 11392 KB Output isn't correct
2 Halted 0 ms 0 KB -