Submission #508837

#	Time	Username	Problem	Language	Result	Execution time	Memory
508837		ETK	Through Another Maze Darkly (CCO21_day1problem3)	C++14	4 / 25	206 ms	130804 KiB

Main

#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=(a);i<=(b);++i)
#define per(i,a,b) for(int i=(a);i>=(b);--i)
#define pii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
#define pb push_back
#define debug(...) fprintf(stderr, __VA_ARGS__)
#define ALL(x) x.begin(),x.end()
#define sz(x) int(x.size())
#define ll long long
using namespace std;
inline ll read(){
    ll x=0,f=1;char ch=getchar();
    while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}
    while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
    return x*f;
}
const int N=4e6+5,P = 1e9 + 7;
int n,q,c[N],tot,ans[N],now[N],lst[N];
vector <int> G[N];
int main(){
    n = read(),q = read();
    rep(i,1,n){
        c[i] = read();
        rep(j,1,c[i]){
            int x = read();
            G[i].pb(x);
        }
    }
    int u = 1;
    rep(i,1,4e6){
        ans[++tot] = u;
        now[u] = (now[u] + 1) % c[u];
        u = G[u][now[u]];
    }
    int T = n,S = 1;
    memset(lst,0x3f,sizeof(lst));
    rep(i,1,tot){
        if(T < i - lst[ans[i]]){
            S = lst[ans[i]];
            T = i - lst[ans[i]];
        }
        lst[ans[i]] = i;
    }
    while(q--){
        ll k = read() + 1;
        if(k <= tot)cout << ans[k] << '\n';
        else{
            k = (k - S) % T + S;
            cout << ans[k] << '\n';
        }
    }
    return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 4 / 4
• Subtask 3: 0 / 12
• Subtask 4: 0 / 5