Mine
public cpp v1 · immutable n = a.length(); int lo = 0, hi = n - 1, ret = 0; while(lo < hi) { while(lo < hi &&a[lo] == 'W') lo++; while(lo < hi && a[hi] == 'B') hi--; if(hi > lo) ret++; } n = a.length(); int lo = 0, hi = n - 1, ret = 0; while(lo < hi) { while(lo < hi &&a[lo] == 'W') lo++; while(lo < hi && a[hi] == 'B') hi--; if(hi > lo) ret++; }