Cod sursa(job #2658484)

Utilizator DordeDorde Matei Dorde Data 14 octombrie 2020 02:37:51
Problema Stramosi Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 1.13 kb
#include <fstream>

using namespace std;
ofstream g ("stramosi.out");
int const N = 250001 , SZ = 1e6;
int v [N][18] , p;
char s [SZ];
int getn (){
    int x = 0;
    while (! isdigit (s [p])){
        ++ p;
        if (p == SZ)
            fread (s , 1 , SZ , stdin) , p = 0;
    }
    while (isdigit (s [p])){
        x = x * 10 + (s [p] - '0');
        ++ p;
        if (p == SZ)
            fread (s , 1 , SZ , stdin) , p = 0;
    }
    return x;
}
int main()
{
    int n , m , i , j , p , cur , q , x;
    freopen ("stramosi.in" , "r" , stdin);
    scanf ("%d%d" , &n , &m);
    fread (s , 1 , SZ , stdin);
    for(i = 1 ; i <= n ; ++ i)
        v [i][0] = getn ();
    for(i = 1 ; (1 << i) <= n ; ++ i)
        for(j = (1 << i) + 1 ; j <= n ; ++ j)
            v [j][i] = v [v [j][i - 1]][i - 1];
    while (m --){
        p = getn () , q = getn ();
        cur = p , x = 0;
        while ((1 << x) < q)
            ++ x;
        for(i = x ; i >= 0 ; -- i)
            if ((1 << i) & q)
                cur = v [cur][i];
        g << cur << '\n';
    }

    //bag parsare sufletul ma doare
    return 0;
}