CodeForces 732A Buy a Shovel
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枚举。
#pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include<map> #include<set> #include<queue> #include<stack> #include<ctime> #include<iostream> using namespace std; typedef long long LL; const double pi=acos(-1.0),eps=1e-10; void File() { freopen("D:\\in.txt","r",stdin); freopen("D:\\out.txt","w",stdout); } template <class T> inline void read(T &x) { char c = getchar(); x = 0; while(!isdigit(c)) c = getchar(); while(isdigit(c)) { x = x * 10 + c - ‘0‘; c = getchar(); } } int k,r; int main() { cin>>k>>r; for(int i=1;;i++) { if(k*i==r||(k*i-r)%10==0||(k*i)%10==0) { cout<<i<<endl; break; } } return 0; }
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