标签:
好吧,被大白书上的入门题给卡了。=_=||
已知LCM(A, B) = C,已知A和C,求最小的B
一开始我想当然地以为B = C / A,后来发现这时候的B不一定满足gcd(A, B) = 1
A要不断地除去gcd(A, B),直到满足gcd(A, B) = 1
B最后就应该乘上A除去的值
1 #include <cstdio> 2 3 typedef long long LL; 4 5 LL gcd(LL a, LL b) 6 { return b == 0 ? a : gcd(b, a%b); } 7 8 int main() 9 { 10 int T; 11 scanf("%lld", &T); 12 LL a, c; 13 while(T--) 14 { 15 scanf("%lld%lld", &a, &c); 16 if(c % a == 0) 17 { 18 LL b = c / a; 19 LL g = gcd(a, b); 20 LL t = 1; 21 while(g != 1) 22 { 23 a /= g; 24 t *= g; 25 g = gcd(a, b); 26 } 27 printf("%lld\n", b*t); 28 } 29 else puts("NO SOLUTION"); 30 } 31 32 return 0; 33 }
标签:
原文地址:http://www.cnblogs.com/AOQNRMGYXLMV/p/4345622.html