【小米oj】节约用电

 1 #define mm(a) memset(a,0,sizeof(a));
 2 #define max(x,y) (x)>(y)?(x):(y)
 3 #define min(x,y) (x)<(y)?(x):(y)
 4 #define Fopen freopen("1.in","r",stdin); freopen("m.out","w",stdout);
 5 #define rep(i,a,b) for(int i=(a);i<=(b);i++)
 6 #define per(i,b,a) for(int i=(b);i>=(a);i--)
 7 #include<bits/stdc++.h>
 8 typedef long long ll;
 9 #define PII pair<ll,ll>
10 using namespace std;
11 const int INF=0x3f3f3f3f;
12 const int MAXN=(int)2e5 + 5;
13 const ll mod=1e9+7;
14 
15 int n,a[MAXN];
16 char s[MAXN];
17 int main() {
18     while(~scanf("%s",s+1)) {
19         n=strlen(s+1);
20         for(int i=1; i<=n; i++)a[i]=s[i]-‘0‘;
21         int ans=0,f=0;
22         for(int i=1; i<=n; i++) {
23             if(a[i]) {
24                 ans++;
25                 for(int j=i; j<=n; j+=i)a[j]^=1;
26             }
27         }
28         printf("%d\n",ans);
29     }
30     return 0;
31 }