Submission #759144

#	Time	Username	Problem	Language	Result	Execution time	Memory
759144		shadow_sami	Construction of Highway (JOI18_construction)	C++17	0 / 100	4 ms	9728 KiB

construction

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
typedef pair<ll,ll> pi;
typedef map<ll,ll> mi;
typedef long double ld;
typedef vector<ld> vd;
typedef vector<vector<ld>> vvd;
typedef pair<ld,ld> pd;
#define ff first
#define ss second
#define srt(a) sort(a.begin(),a.end());
#define fip(k, n) for (ll i = k; i < n; i++)
#define fjp(k, n) for (ll j = k; j < n; j++)
#define fin(k, n) for (ll i = k; i >= n; i--)
#define fjn(k, n) for (ll j = k; j >= n; j--)
#define fp(k, n, m) for (ll k = n; k < m; k++)
#define fn(k, n, m) for (ll k = n; k >= m; k--)
#define ordered_set tree<pi, null_type,less< pi >, rb_tree_tag,tree_order_statistics_node_update>
#define totalOne(n) __builtin_popcount(n)
#define backZero(n) __builtin_ctzll(n)
#define frontZero(n) __builtin_clzll(n)
#define fx(k) for ( auto x : k )
#define test ll t;cin >> t;while (t--)
#define nli "\n"

// ==========================(debug)============================================================================================== //

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _printn(x); cerr << nli;
#else
#define debug(x)
#endif

void _printn(ll x){ cerr<<x<<" "; }
void _printn(int x){ cerr<<x<<" "; }
void _printn(ld x){ cerr<<x<<" "; }
void _printn(double x){ cerr<<x<<" "; }
void _printn(string x){ cerr<<x<<" "; }
void _printn(char x){ cerr<<x<<" "; }
void _printn(bool x){ cerr<<x<<" "; }
template<class T,class V>void _printn(pair<T,V> vv);
template<class T> void _printn(vector<T> vv);
template<class T> void _printn(set<T> vv);
template<class T,class V> void _printn(map<T,V> vv);
template<class T> void _printn(multiset<T> vv);
template<class T,class V>void _printn(pair<T,V> vv){ cerr<<"( ";_printn(vv.ff);cerr<<",";_printn(vv.ss);cerr<<")";}
template<class T> void _printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T> void _printn(set<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T> void _printn(multiset<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T,class V> void _printn(map<T,V> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };

// ==========================(debug)============================================================================================== //

ll n,m,tp,tp2,res,cnt,sum,tptp,ans;
const ll mx = 2e5+5;
const ll mod = 1e9+7;

// ==========================(MOD)=============================================================================================== //

ll mod_add(ll aa,ll bb){ return ((aa%mod)+(bb%mod))%mod; }
ll mod_minus(ll aa,ll bb){ return (((aa%mod)-(bb%mod))+10*mod)%mod; }
ll mod_mul(ll aa,ll bb){ return ((aa%mod)*(bb%mod))%mod; }
ll mod_power(ll aa,ll bb){ aa%=mod; ll empowered = 1; bb%=mod-1; while(bb > 0){ if(bb & 1) empowered = mod_mul(empowered,aa); bb = bb >> 1; aa = mod_mul(aa,aa); } return empowered; }
ll mod_divi(ll aa,ll bb){ aa=mod_mul(aa,mod_power(bb,mod-2)); return aa; }

// ==========================(MOD)=============================================================================================== //

bool f = false;
ll hld[mx];
ll dep[mx];
ll a[mx];
vi adj[mx];
ll sz[mx];
ll to[mx];
ll parent[mx];
ll sr,de;
vector<pi> lis[mx];

typedef struct Binary_indexed_tree{
	vi arr;
	ll range;
	ll sm = 0;
	void init(ll k){
		range = log2(k);
		range = 1<<(k+1);
		arr.resize(range);
		fip(0,range)
			arr[i] = 0;
		return;
	}
	ll get(ll l){
		sm = 0;
		for(ll i = l ; i > 0; i -= (i & -i))
			sm += arr[i];
		return sm;
	}
	void update(ll l,ll val){
		for(ll i = l ; i < range; i += (i & -i))
			arr[i] += val;
		return ;
	}
}BIT;

BIT bit;

void hld_dfs(ll u,ll par,ll hd){
	hld[u] = hd;
	if(to[u] != -1)
			hld_dfs(to[u],u,hd);
	fx(adj[u]){
		if(x==par || x ==to[u])
			continue;
		hld_dfs(x,u,x);
	}
	return;
}

void dfs(ll u,ll par){
	parent[u] = par;
	sz[u] = 1;
	ll tc=-1,tx=-1;
	fx(adj[u])
		if(x!=par){
			dep[x] = dep[u] + 1;
			dfs(x,u);
			sz[u] += sz[x];
			if(sz[x] > tc){
				tc = sz[x];
				tx = x;
			}
		}
	to[u] = tx;
	return;
}

void init(ll k){
	fip(0,n+2){
		dep[i] = 0;
		to[i] = -1;
		hld[i] = -1;
		sz[i] = 0;
	}
	return ;
}

ll aa,bb,range,let;

ll calc(ll u,ll v){
	vector<pi> na;
	vector<pi> v2;
	u = v;
	while(u != -1){
		aa = u;
		let = 0;
		bb = hld[aa];
		range = dep[aa] - dep[bb] + 1;
		vector<pi> &ss = lis[bb];
		v2.clear();
		while(ss.size() && ss.back().ss <= range){
			v2.push_back({ss.back().ff,ss.back().ss-let});
			let = ss.back().ss;
			ss.pop_back();
		}
		if(ss.size())
			v2.push_back({ss.back().ff,ss.back().ss-let});
		ss.push_back({a[v],range});
		u = parent[bb];
		fin((int)v2.size()-1,0)
			na.push_back(v2[i]);
	}
	res = 0;
	m = na.size();
	vi vv;
	fx(na)
		vv.push_back(x.ff);
	srt(vv);
	fip(0,m)
		na[i].ff = (lower_bound(vv.begin(),vv.end(),na[i].ff) - vv.begin()) + 1; 
	bit.init(m);
	fx(na){
		res += (x.ss*bit.get(x.ff-1));
		bit.update(x.ff,x.ss);
	}
	return res;
}

vector<pi> ve;

int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    // #ifndef ONLINE_JUDGE
    //     freopen("input1.txt", "r", stdin);
    //     freopen("output1.txt", "w", stdout);
    //     freopen("error1.txt", "w", stderr);
    // #endif // ONLINE_JUDGE

        cin>>n;
        init(n);
        fip(1,n+1)	
        	cin>>a[i];
        fip(1,n){
        	cin>>sr>>de;
        	ve.push_back({sr,de});
        	adj[sr].push_back(de);
        	adj[de].push_back(sr);
        }
        dfs(1,-1);
        hld_dfs(1,1,1);
        lis[1].push_back({a[1],1});
        fx(ve){
        	cout<<calc(x.ff,x.ss)<<nli;
        }
        
    cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 9
• Subtask 3: 0 / 84