Cod sursa(job #2476973)

Utilizator david.teacaDavid Stefan Teaca david.teaca Data 19 octombrie 2019 13:25:39
Problema Stramosi Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.68 kb
#include <fstream>



using namespace std;



ifstream fin( "stramosi.in" );

ofstream fout( "stramosi.out" );

int dp[250001][19];

int lg[250001];

int main() {

    int n, m, i, j, a, b;

    fin >> n >> m;

    for( i = 1; i <= n; ++i )

        fin >> dp[i][0];

    for( i = 1; i <= n; ++i )

        for( j = 1; j <= 18; ++j )

            dp[i][j] = dp[dp[i][j - 1]][j - 1];

    for( i = 2; i <= n; ++i )

      lg[i] = lg[i >> 1] + 1;

    for( i = 1; i <= m; ++i ) {

        fin >> a >> b;

        for( j = 18; j >= 0; --j )

          if( b & (1 << j) )

            a = dp[a][j];

        fout << a << "\n";

    }

    return 0;

}