C. Vanya and Scales

Vanya has a scales for weighing loads and weights of masses?w0,?w1,?w2,?...,?w100?grams where?w?is some integer not less than?2(exactly one weight of each nominal value). Vanya wonders whether he can weight an item with mass?m?using the given weights, if the weights can be put on both pans of the scales. Formally speaking, your task is to determine whether it is possible to place an item of mass?m?and some weights on the left pan of the scales, and some weights on the right pan of the scales so that the pans of the scales were in balance.

Input

The first line contains two integers?w,?m?(2?≤?w?≤?109,?1?≤?m?≤?109) — the number defining the masses of the weights and the mass of the item.

Output

Print word 'YES' if the item can be weighted and 'NO' if it cannot.

Sample test(s) input 3 7 output YES input 100 99 output YES input 100 50 output NO Note

Note to the first sample test. One pan can have an item of mass?7?and a weight of mass?3, and the second pan can have two weights of masses?9?and?1, correspondingly. Then?7?+?3?=?9?+?1.

Note to the second sample test. One pan of the scales can have an item of mass?99?and the weight of mass?1, and the second pan can have the weight of mass?100.

Note to the third sample test. It is impossible to measure the weight of the item in the manner described in the input.

?

題意：給定兩個數，m和w，現有w^0, w^1, w^2...w^100各一個重量的mass， 用其中的一些mass，時候能稱出m的重量。

也就是有如下圖的式子：

#include<iostream> #include<cstring> #include<cstdio> #include<algorithm> using namespace std;int main(){int m, w;cin>>w>>m;while(m){if(!((m-1)%w)) m--;else if(!((m+1)%w)) m++;else if(m%w){cout<<"NO"<<endl;return 0;}m/=w;}cout<<"YES"<<endl;return 0; }

?

轉載于:https://www.cnblogs.com/hujunzheng/p/4598396.html

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