版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zhoujiaping123/article/details/81747748
let num = '6345214';
let K = 4;
let res = [];
let max = 0;
function backtrace(k){
let c = consumed(k);
if(k==K){
if(c.length==num.length){
console.info(res);
let ans = res.reduce((prev,curr)=>prev*curr,1);
console.info(ans);
max = Math.max(max,ans);
}
return;
}
for(let i=1;i<=num.length;i++){
if(c.length+i<=num.length){
res[k] = num.substr(c.length,i);
backtrace(k+1);
}
}
}
function consumed(k){
let used = '';
for(let j=0;j<k;j++){
used+=res[j];
}
return used;
}
backtrace(0);
console.info(max);