javascript常见问题之黑白卡片

 1 (function main(){ 2     var line = readline().split(' '); 3     var count_1; 4     var count_2; 5     var arr=line[0]; 6     count_1=Turnover(arr,'B','W'); 7     count_2=Turnover(arr,'W','B'); 8     if (count_1<count_2) { 9         print(count_1);10     }else{11         print(count_2);12     }13 })();14 function  Turnover(str,card1,card2){15     var count=0;16     for(var i=0;i<str.length;i++){17         if(i%2==0&&str[i]!=card1){18             str[i]=card1;19             count++;20         }else if(i%2==1&&str[i]!=card2){21             str[i]=card2;22             count++;23         }24     }25     return count;26 }