Bayan 2015 Contest Warm Up D. CGCDSSQ 暴力
链接:
http://codeforces.com/contest/475/problem/D
题意:
给你一个a数组,每次询问一个x,问有多少区间的gcd等于x
题解:
直接暴力打表,因为gcd的值不会有太多不同的,所以不会超时
代码:
31 ll n; 32 ll a[MAXN]; 33 map<ll, ll> ans; 34 map<ll, ll> last; 35 map<ll, ll> now; 36 37 ll gcd(ll a, ll b) { 38 return b == 0 ? a : gcd(b, a%b); 39 } 40 41 int main() { 42 ios::sync_with_stdio(false), cin.tie(0); 43 cin >> n; 44 rep(i, 0, n) cin >> a[i]; 45 rep(i, 0, n) { 46 now[a[i]]++; 47 for (auto it = last.begin(); it != last.end(); ++it) 48 now[gcd((*it).first, a[i])] += (*it).second; 49 for (auto it = now.begin(); it != now.end(); ++it) 50 ans[(*it).first] += (*it).second; 51 last = now; 52 now.clear(); 53 } 54 int q; 55 cin >> q; 56 while (q--) { 57 int x; 58 cin >> x; 59 cout << ans[x] << endl; 60 } 61 return 0; 62 }