Submission #829849

#	Time	Username	Problem	Language	Result	Execution time	Memory
829849		tolbi	Duathlon (APIO18_duathlon)	C++17	23 / 100	502 ms	1048576 KiB

count_triplets

#pragma optimize("Bismillahirrahmanirrahim")
//█▀█─█──█──█▀█─█─█
//█▄█─█──█──█▄█─█■█
//█─█─█▄─█▄─█─█─█─█
//Allahuekber
//ahmet23 orz...
//FatihSultanMehmedHan
//YavuzSultanSelimHan
//AbdulhamidHan
//Sani buyuk Osman Pasa Plevneden cikmam diyor
#define author tolbi
#include <bits/stdc++.h>
using namespace std;
#define deci(x) int x;cin>>x;
#define decstr(x) string x;cin>>x;
#define sortarr(x) sort(x.begin(), x.end())
#define sortrarr(x) sort(x.rbegin(), x.rend())
#define rev(x) reverse(x.begin(), x.end())
#define cinarr(x) for (auto &it : x) cin>>it;
#define coutarr(x) for (auto &it : x) cout<<it<<" ";cout<<endl;
#define tol(bi) (1LL<<((int)(bi)))
#define endl '\n'
typedef long long ll;
//mt19937 ayahya(chrono::high_resolution_clock().now().time_since_epoch().count());
ll solve(int n, vector<int> u, vector<int> v){
    int totn = n;
    vector<vector<int>> arr(n);
    for (int i = 0; i < u.size(); i++){
        arr[u[i]].push_back(v[i]);
        arr[v[i]].push_back(u[i]);
    }
    vector<int> dept(n,-1);
    vector<int> stk;
    vector<int> ele(n);
    vector<int> sz;
    vector<vector<int>> hehe;
    function<int(int,int)> f;
    vector<int> par(n);
    f = [&](int node, int lnode)->int{
        if (lnode!=-1) par[node]=lnode;
        if (lnode!=-1) dept[node]=dept[lnode]+1;
        int mide = dept[node];
        for (int i = 0; i < arr[node].size(); i++){
            if (arr[node][i]==lnode) continue;
            if (dept[arr[node][i]]!=-1){
                mide=min(mide,dept[arr[node][i]]);
                continue;
            }
            mide=min(mide,f(arr[node][i],node));
        }
        stk.push_back(node);
        if (mide==dept[node]){
            sz.push_back(0);
            while (stk.size()){
                ele[stk.back()]=hehe.size();
                stk.pop_back();
                sz.back()++;
            }
            hehe.push_back(vector<int>());
        }
        return mide;
    };
    dept[0]=0;
    f(0,-1);
    for (int i = 1; i < n; i++){
        if (ele[i]!=ele[par[i]]){
            hehe[ele[i]].push_back(ele[par[i]]);
            hehe[ele[par[i]]].push_back(ele[i]);
        }
    }
    n=hehe.size();
    dept[0]=0;
    swap(arr,hehe);
    ll ans = 0;
    for (int i = 0; i < sz.size(); i++){
        ans+=sz[i]*(sz[i]-1)*(sz[i]-2);
    }//3 from cycle
    vector<int> subsz(n);
    //coutarr(sz);
    f = [&](int node, int lnode)->int{
        subsz[node]=sz[node];
        for (int i = 0; i < arr[node].size(); i++){
            if (arr[node][i]==lnode) continue;
            f(arr[node][i],node);
            subsz[node]+=subsz[arr[node][i]];
            ans+=((ll)subsz[arr[node][i]])*((ll)sz[node])*((ll)totn-subsz[arr[node][i]]-sz[node]);
            //2 from outside, 1 from cycle
            ans+=(ll)(sz[node]-1)*((ll)sz[node]-1)*(ll)subsz[arr[node][i]]*2LL;
            //2 from cycle, 1 from outside
        }
        ans+=(ll)(sz[node]-1)*((ll)sz[node]-1)*((ll)totn-subsz[node])*2LL;
        ans+=(ll)(sz[node])*((ll)totn-subsz[node])*((ll)subsz[node]-(ll)sz[node]);
        return 23;
    };
    f(0,-1);
    return ans;
}
int32_t main(){
	int T = 1;
	int tno = 0;
	while (T-(tno++)){
        deci(n);deci(m);
        vector<int> par(n);
        iota(par.begin(), par.end(), 0);
        function<int(int)> find;
        find = [&](int node)->int{
        	if (par[node]==node) return node;
        	return par[node]=find(par[node]);
        };
        vector<pair<int,int>> edges(m);
        for (int i = 0; i < m; i++){
        	cin>>edges[i].first>>edges[i].second;
        	edges[i].first--,edges[i].second--;
        	int u = edges[i].first;
        	int v = edges[i].second;
        	u=find(u);
        	v=find(v);
        	par[u]=v;
        }
        map<int,int> mp;
        map<int,vector<int>> u;
        map<int,vector<int>> v;
        vector<int> indis(n);
        for (int i = 0; i < n; i++){
        	indis[i]=mp[find(i)]++;
        }
        for (int i = 0; i < m; i++){
        	u[find(edges[i].first)].push_back(indis[edges[i].first]);
        	v[find(edges[i].first)].push_back(indis[edges[i].second]);
        }
        ll ans = 0;
        for (auto it : mp){
        	ans+=solve(it.second,u[it.first],v[it.first]);
            u.erase(it.first);
            v.erase(it.first);
        }
        cout<<ans<<endl;
	}
}

Compilation message (stderr)

count_triplets.cpp:1: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    1 | #pragma optimize("Bismillahirrahmanirrahim")
      | 
count_triplets.cpp: In function 'll solve(int, std::vector<int>, std::vector<int>)':
count_triplets.cpp:28:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for (int i = 0; i < u.size(); i++){
      |                     ~~^~~~~~~~~~
count_triplets.cpp: In lambda function:
count_triplets.cpp:43:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         for (int i = 0; i < arr[node].size(); i++){
      |                         ~~^~~~~~~~~~~~~~~~~~
count_triplets.cpp: In function 'll solve(int, std::vector<int>, std::vector<int>)':
count_triplets.cpp:75:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |     for (int i = 0; i < sz.size(); i++){
      |                     ~~^~~~~~~~~~~
count_triplets.cpp: In lambda function:
count_triplets.cpp:82:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |         for (int i = 0; i < arr[node].size(); i++){
      |                         ~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 10 / 10
• Subtask 5: 13 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10