A B 1 3 4
1 ""
for example, when there are four stairs, there are four situations.
here is the js version I wrote after the code given in the author"s example.
//.
//Number
function NumCopy(num) {
var copy = num-0;
return copy;
}
let N = 4, steps = 3, memo = {};
function move(a, b) {
if([a, b] in memo) {
return memo[[a, b]];
}
if(a>b) {
return memo[[a, b]] = 0;
}
if(a == b) {
return memo[[a, b]] = 1;
}
if(b>a) {
for(let i=1; i<=steps; iPP) {
for(let j=1; j<=steps; jPP) {
cnt += move(NumCopy(a+i), NumCopy(b-j));
}
}
}
memo[[a, b]] = cnt;
}
let cnt = 0;
console.log(move(0, N));I don"t know what"s wrong this time?