is it a prime
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first: o(n)
int is_prime(int x){ for(int i = 2; i < x; i ++) if(x % 2 == 0) return 0; return 1;}
second: o(logn)
int is_prime(int x){ for(int i = 2; i*i <= x; i ++) { if(x % i == 0) return 0; } return 1;}但是i*i可能会溢出。(这种方法慎用。)
three:
int is_prime(int x){ for(int i = 2; i <=floor(sqrt(x)+0.5); i ++) { if(x % i == 0) return 0; } return 1;}
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