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#include <stdio.h> main() { int i, j, c; int p[1001]={0}; c = 0; printf(" 2\n"); for(i=3; i<=1000; i+=2) { if(p[i]==1){++c;continue;} if(p[i]==0)printf("%4d\n",i); for(j=i+i;j<=1000;j+=i) { ++c; p[j]=1; } } printf("計算回数:%d\n", c); }
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