Submission #1192620

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192620		shadow_sami	Joker (BOI20_joker)	C++20	25 / 100	1750 ms	48328 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];
bool mark[205][mx];

typedef struct Disjoint_Set_Union{
	vi par,sz,cos,mark;
	ll range,rs,src,dest;
	ll c1,c2;
	vvi 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({dest,par[dest],cos[dest]});
		par[dest] = src;
		cos[dest] ^= c1^c2^1;
		sz[src] += sz[dest];
		return 1;
	}
	void rollback(){
		while(lis.size()){
			auto it = lis.back();
			lis.clear();
			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;

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];
        fip(0,min(m,201ll)){
        	dsu.init(n);
        	f = 0;
        	fjp(0,i)
        		dsu.unite(from[j],to[j]);
        	fjn(m-1,i){
        		dsu.unite(from[j],to[j]);        	
        		mark[i][j-1] = f;
        	}
        }    
        fip(0,tptp)    	{
        	cin>>tp>>tp2;
        	tp--,tp2--;
        	cout<<(mark[tp][tp2]?"YES":"NO")<<nli;
        }
        
    cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 25 / 25
• Subtask 3: 0 / 10
• Subtask 4: 0 / 22
• Subtask 5: 0 / 29
• Subtask 6: 0 / 6