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perftune/sieve.c

@@ -24,7 +24,7 @@ int *sieve(int n) {
     is_prime[j] = false;
 
   //use other primes
-  int pi;
+  int pi = 3;
   for (int i = 3; i <= n; i+=2) {
     if(!is_prime[i]) continue;  //use prime i only
     //到这里确定是质数