Submission #1192626

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192626		shadow_sami	Joker (BOI20_joker)	C++20	100 / 100	475 ms	21396 KiB

Joker

#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)============================================================================================== //

#ifdef SAMI
	#define debug(x) cerr<<#x;cerr<<" ";_printn(x);cerr<<nli;
	#define debg() cerr<<nli;
#else
	#define debug(x)
	#define debg() 
#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 from[mx];
ll to[mx];
ll lst[mx];

typedef struct Disjoint_Set_Union{
	vi par,sz,cos,mark;
	ll range,rs,src,dest;
	ll c1,c2;
	vector<vector<int>> lis;
	void init(ll k){
		k += 5;
		par.resize(k);
		sz.resize(k);
		cos.resize(k);		
		f = 0;
		fip(0,k){
			par[i] = i;
			sz[i] = 1;
			cos[i] = 0;			
		}
	}
	ll find(ll k){		
		while(k!=par[k]){						
			k = par[k];
		}
		return k;
	}
	ll get(ll k){
		rs = cos[k];
		while(k!=par[k]){									
			k = par[k];
			rs ^= cos[k];
		}
		return rs;
	}
	bool unite(ll u,ll v){
		src = find(u);
		dest = find(v);
		c1 = get(u);
		c2 = get(v);
		if(src==dest){
			if(c1==c2 && !f){
				f = 1;
				lis.push_back({-1});					
			}			
			return 0;		
		}
		if(sz[src] < sz[dest]){
			swap(c1,c2);
			swap(src,dest);
		}
		lis.push_back({(int)dest,(int)par[dest],(int)cos[dest]});
		par[dest] = src;
		cos[dest] ^= c1^c2^1;
		sz[src] += sz[dest];
		return 1;
	}
	void rollback(ll k){
		while((ll)lis.size()>k){
			auto it = lis.back();
			lis.pop_back();
			if(it[0]==-1)
				f = 0;
			else{
				sz[par[it[0]]] -= sz[it[0]];
				cos[it[0]] = it[2];
				par[it[0]] = it[1];
			}
		}
		return;
	}
	void destroy(){
		lis.clear();
	}
}DSU;

DSU dsu;
ll mid;
ll st,en;

void divide(ll l1,ll l2,ll r1,ll r2){	
	if(l1>l2)
		return;
	debug(l1);
	debug(l2);
	debug(r1);
	debug(r2);
	ll pt2 = dsu.lis.size();		
	mid = l1 + (l2-l1)/2;	
	while(l1 > st){
		dsu.unite(from[st],to[st]);
		st++;		
	}
	while(r2 < en){		
		dsu.unite(from[en],to[en]);
		en--;
	}
	debug(f);
	ll pt = dsu.lis.size();		
	debug(dsu.lis);
	while(mid > st){
		dsu.unite(from[st],to[st]);
		// debug(f);
		st++;		
	}
	fin(r2,r1){
		if(f){
			lst[mid] = i;
			break;
		}
		if(i<m){			
			dsu.unite(from[i],to[i]);	
			// debug(f)	
			if(f){
				lst[mid] = i;
				break;
			}			
		}
	}	
	debug(dsu.lis);
	dsu.rollback(pt);	
	st = l1;
	en = r2;
	if(en==m)en--;
	debug(mid);
	debug(lst[mid])
	debg()	;
	divide(l1,mid-1,r1,lst[mid]);
	divide(mid+1,l2,lst[mid],r2);		
	st = l1;
	en = r2;
	if(en==m)en--;
	dsu.rollback(pt2);	
	return;
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());	
    #ifdef SAMI
        freopen("input1.txt", "r", stdin);
        freopen("output1.txt", "w", stdout);
        freopen("error1.txt", "w", stderr);
    #endif // ONLINE_JUDGE

        cin>>n>>m>>tptp;
        fip(0,m)
        	cin>>from[i]>>to[i];
        dsu.init(n);
        st = 0;
        en = m-1;
        divide(0,m-1,0,m);
        // fip(0,m)
        // 	cout<<lst[i]<<" ";
        // cout<<nli;
        fip(0,tptp)    	{
        	cin>>tp>>tp2;
        	tp--,tp2--;
        	cout<<(lst[tp]>tp2?"YES":"NO")<<nli;
        }
        
    cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 25 / 25
• Subtask 3: 10 / 10
• Subtask 4: 22 / 22
• Subtask 5: 29 / 29
• Subtask 6: 6 / 6