[USACO08DEC]Patting Heads S
直接倍数筛即可。
时间复杂度 $O(n\ln n)$。
代码:
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| #include<iostream> #include<cstdio> #include<algorithm> #define ll long long using namespace std;
const ll N=1e5,M=1e6;
ll n;
ll f[M+5],ans[M+5],a[N+5];
inline ll read() { ll ret=0,f=1;char ch=getchar(); while(ch<'0'||ch>'9') {if(ch=='-') f=-f;ch=getchar();} while(ch>='0'&&ch<='9') {ret=(ret<<3)+(ret<<1)+ch-'0';ch=getchar();} return ret*f; }
void write(ll x) { static char buf[22];static ll len=-1; if(x>=0) { do{buf[++len]=x%10+48;x/=10;}while(x); } else { putchar('-'); do{buf[++len]=-(x%10)+48;x/=10;}while(x); } while(len>=0) putchar(buf[len--]); }
void writeln(ll x) { write(x);putchar('\n'); }
int main() {
n=read();
for(ll i=1;i<=n;i++) { a[i]=read();f[a[i]]++; }
for(ll i=1;i<=M;i++) { if(f[i]) { for(ll j=i;j<=M;j+=i) { ans[j]+=f[i]; } ans[i]-=1; } }
for(ll i=1;i<=n;i++) { writeln(ans[a[i]]); }
return 0; }
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