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Create isPrime.cpp
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.ACM-Templates/isPrime.cpp
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20
.ACM-Templates/isPrime.cpp
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//Written by Coffee. 判断素数
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bool isPrime(int num)
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{
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if (num == 2 || num == 3)
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{
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return true;
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}
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if (num % 6 != 1 && num % 6 != 5)
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{
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return false;
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}
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for (int i = 5; i*i <= num; i += 6)
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{
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if (num % i == 0 || num % (i+2) == 0)
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{
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return false;
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}
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}
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return true;
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}
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