我无法在程序中弄清楚这个陈述......这句话在下面的代码中意味着什么？如何进行手术？
ok = ok & a[c[i][j]] [c[i][k]];
bool ok = 1;
for(unsigned int i = 0; i < 2; i++)
for(unsigned int j = 0; j < c[i].size(); j++)
for(unsigned int k = j + 1; k < c[i].size(); k++)
ok = ok & a[c[i][j]] [c[i][k]];
//print yes if ok = 1