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为什么老wa 大家看看 欧拉函数的#include <iostream> using namespace std; const int MAX = 31624 + 10; //1000000000的平方根 bool nprime[MAX]; int prime[MAX]; int main() { memset(nprime, 0, sizeof(bool)*MAX); int i, j; for(i = 2; i < MAX/2; i ++) { for(j = i*i; j < MAX; j += i) nprime[j] = true; } int c = 0; for(i = 2; i < MAX; i ++) if(!nprime[i]) { prime[c ++] = i; } int n; while(cin >> n && n) { int ans = n; for(i = 0; i < c; i ++) { if(n%prime[i] == 0) { ans /= prime[i]; ans *= prime[i] - 1; } } if(ans == n) ans = n - 1; cout << ans << endl; } return 0; } Followed by:
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