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Submission #261633

# Submission time Handle Problem Language Result Execution time Memory
261633 2020-08-11T23:10:22 Z Rouge_Hugo Duathlon (APIO18_duathlon) C++14
23 / 100
 177 ms 29024 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])-2)*2;
        re+=(sz[x])*(bo[x]-1)*(bo[x]-2)*2;
    }
    re+=(bo[x]-1)*up*2;
    re+=(bo[x]-1)*(sz[x])*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:93:10: 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:97:14: 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 7 ms 11392 KB Output is correct
2 Correct 7 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11316 KB Output is correct
5 Correct 7 ms 11392 KB Output is correct
6 Correct 7 ms 11392 KB Output is correct
7 Incorrect 7 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 7 ms 11392 KB Output is correct
2 Correct 7 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11316 KB Output is correct
5 Correct 7 ms 11392 KB Output is correct
6 Correct 7 ms 11392 KB Output is correct
7 Incorrect 7 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 131 ms 27128 KB Output is correct
2 Correct 127 ms 27000 KB Output is correct
3 Incorrect 143 ms 26232 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 10 ms 11520 KB Output is correct
2 Correct 10 ms 11520 KB Output is correct
3 Correct 9 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 8 ms 11520 KB Output is correct
7 Correct 8 ms 11520 KB Output is correct
8 Correct 8 ms 11552 KB Output is correct
9 Correct 10 ms 11520 KB Output is correct
10 Correct 8 ms 11520 KB Output is correct
11 Correct 9 ms 11520 KB Output is correct
12 Correct 10 ms 11520 KB Output is correct
13 Correct 9 ms 11520 KB Output is correct
14 Correct 8 ms 11520 KB Output is correct
15 Correct 8 ms 11520 KB Output is correct
16 Correct 8 ms 11392 KB Output is correct
17 Correct 9 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 137 ms 24620 KB Output is correct
2 Correct 148 ms 24568 KB Output is correct
3 Correct 151 ms 24544 KB Output is correct
4 Correct 135 ms 24568 KB Output is correct
5 Correct 141 ms 24696 KB Output is correct
6 Correct 144 ms 29024 KB Output is correct
7 Correct 158 ms 27672 KB Output is correct
8 Correct 156 ms 26872 KB Output is correct
9 Correct 156 ms 25976 KB Output is correct
10 Correct 137 ms 24568 KB Output is correct
11 Correct 140 ms 24568 KB Output is correct
12 Correct 138 ms 24568 KB Output is correct
13 Correct 134 ms 24568 KB Output is correct
14 Correct 136 ms 24112 KB Output is correct
15 Correct 122 ms 23544 KB Output is correct
16 Correct 77 ms 21624 KB Output is correct
17 Correct 108 ms 24296 KB Output is correct
18 Correct 87 ms 24296 KB Output is correct
19 Correct 91 ms 24416 KB Output is correct
20 Correct 96 ms 24432 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 8 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 138 ms 24628 KB Output is correct
2 Correct 145 ms 24568 KB Output is correct
3 Incorrect 177 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 Correct 7 ms 11392 KB Output is correct
2 Correct 7 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11316 KB Output is correct
5 Correct 7 ms 11392 KB Output is correct
6 Correct 7 ms 11392 KB Output is correct
7 Incorrect 7 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 7 ms 11392 KB Output is correct
2 Correct 7 ms 11392 KB Output is correct
3 Correct 8 ms 11392 KB Output is correct
4 Correct 8 ms 11316 KB Output is correct
5 Correct 7 ms 11392 KB Output is correct
6 Correct 7 ms 11392 KB Output is correct
7 Incorrect 7 ms 11392 KB Output isn't correct
8 Halted 0 ms 0 KB -