Submission #1232096

#	Time	Username	Problem	Language	Result	Execution time	Memory
1232096		ender_shayan	Joker (BOI20_joker)	C++20	0 / 100	9 ms	19220 KiB

Joker

#include <bits/stdc++.h>

using namespace std;

// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;

typedef long long ll;
typedef long double	ld;
typedef pair<int, int>	pii  ;
typedef pair<ll, ll>	pll  ;
typedef vector<pii>     vii  ;
typedef vector<int>     veci ;
typedef vector<pll>     vll  ;
typedef vector<ll>      vecll;

// find_by_order             order_of_key

//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define F		        first
#define S		        second
#define pb		        push_back
#define endl            '\n'
#define Mp		        make_pair
#define all(x)          x.begin(), x.end()
#define debug(x)        cerr << #x << " = " << x << endl
#define set_dec(x)	    cout << fixed << setprecision(x);
#define fast_io         ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io         freopen("in.txt" , "r" , stdin) ; freopen("out.txt" , "w" , stdout);
#define lb              lower_bound
#define ub              upper_bound
#define for1(n)         for(int i=1;i<=n;i++)
#define for0(n)         for(int i=0;i<n;i++)
#define forn(n)         for(int i=n;i>0;i--)
#define pq              priority_queue <pii, vector<pii>, greater<pii>>


const int N=2e5+10;
int n,m,k,q,c[N],par[N],sz[N],ans[N],mx;
vector<int>seg[N*4];
vector<pii> vec;
pii edg[N];
int get_par(int v){
    if(!par[v])return v;
    return get_par(par[v]);
}
int get_c(int v){
    if(!par[v])return 0;
    return get_c(par[v])^c[v];
}
void Undo(){
    int u=vec.back().F,v=vec.back().S;
    par[u]=0;
    sz[v]-=sz[u];
    vec.pop_back();
}
void merg(int u,int v){
    int cc=get_c(u)^get_c(v)^1;
    u=get_par(u);
    v=get_par(v);
    if(u==v)return;
    if(sz[u]>sz[v])swap(u,v);
    vec.pb({u,v});
    c[u]=cc;
    par[u]=v;
    sz[v]+=sz[u];
}
void upd(int lx,int rx,int l=1,int r=m+1,int v=1){
    if(lx>=r || rx<=l)return;
    if(lx<=l && r<=rx){
        seg[v].pb(rx-1);
        return;
    }
    int mid=(l+r)>>1;
    upd(lx,rx,l,mid,v<<1);
    upd(lx,rx,mid,r,v<<1|1);
}
void dfs(int l=1,int r=m+1,int v=1){
    int t=0;
    for(int i:seg[v])if(get_par(edg[i].F)!=get_par(edg[i].S)){merg(edg[i].F,edg[i].S);t++;}
    if(r-l==1){
        for(;mx<=m;mx++){
            int uu=edg[mx].F,vv=edg[mx].S;
            if(get_par(uu)!=get_par(vv)){
                merg(uu,vv);
                upd(l+1,mx+1);
                t++;
            }
            else if(get_c(uu)!=get_c(vv))
                upd(l+1,mx+1);
            else
                break;
        }
        ans[l]=mx;
        while(t--)Undo();
        return;
    }
    int mid=(l+r)>>1;
    dfs(l,mid,v<<1);
    dfs(mid,r,v<<1|1);
    while(t--)Undo();
}
int main(){
    fast_io
    cin>>n>>m>>q;
    for1(n)sz[i]=1;
    for1(m)cin>>edg[i].F>>edg[i].S;
    mx=1;
    dfs();
    while(q--){
        int l,r;cin>>l>>r;
        cout<<(r<ans[l] ? "YES\n":"NO\n");
    }




}

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