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110MS,打表。1140K 110MS 如果i是素数,那么判断n-i是否是素数,是的话输出。 为神马一开始老wrong answer.不知道原因的情况下再次提交就对了。。神马啊。 #include <iostream> using namespace std; #define MAX 1000000 bool prime[MAX+1];//ini false void judgePrime() {//==0是素数 for(int i=2;i*i<=MAX;i++) if(prime[i]==0) for(int j=i+i;j<=MAX;j += i) prime[j]=1; } int main() { judgePrime(); while(1) { int n; scanf("%d",&n); if(n==0) break; for(int i=3;i<=n/2;i += 2) { if(prime[i]==0 && prime[n-i]==0) { printf("%d = %d + %d\n",n,i,n-i); break; } } } return 0; } Followed by:
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