Create 2019-E-C.cpp

Author: tmp-coder

Diff for: kick-start/2019-E-C.cpp

@@ -0,0 +1,107 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+#define ms(x,v) memset(x,(v), sizeof(x))
+#define msn(x,v,n) memset(x,(v),sizeof(x[0]) * n)
+#define INF 0x3f3f3f3f
+#define random(a,b) (rand() % ((b) -(a)) +(a))
+
+typedef long long LL;
+typedef pair<int,int> PII;
+
+const int MAXN = 1e6+10;
+
+namespace Prime{
+    LL power_mod(LL x,LL n,LL mod){
+        LL ret =1;
+        while(n){
+            if(n & 1) ret = x * ret % mod;
+            x = x * x % mod;
+            n >>=1;
+        }
+        return ret;
+    }
+    LL mulmod(LL x,LL y,LL n){
+        return x * y % n;
+    }
+    bool witness(LL a,LL n,LL u,LL t){
+        LL x0 = power_mod(a,u,n),x1;
+        for(int i=1 ;i<=t ; ++i){
+            x1 = mulmod(x0,x0,n);
+            if(x1==1 && x0!=1 && x0!=n-1)
+                return false;
+            x0 = x1;
+        }
+        if(x1 !=1)return false;
+        return true;
+    }
+
+    bool miller_rabin(LL n, int times = 20){
+        if(n<2)return false;
+        if(n==2)return true;
+        if(!(n&1))return false;
+        LL u = n-1,t =0;
+        while (u%2==0) {
+            t++;u>>=1;
+        }
+        while (times--) {
+            LL a = random(1,n-1);
+            //if(a == 0)std::cout << a << " "<<n<< " "<<u<<" " << t<<'\n';
+            if(!witness(a,n,u,t))return false;
+        }
+        return true;
+    }
+};
+
+int start;
+inline bool check_prime(int x){
+    return x == 1 || Prime::miller_rabin(x);
+}
+
+int check(int x){
+    int cnt =0;
+    while(x %2 ==0){
+        x /=2;
+        cnt ++;
+        if(cnt >=4)break;
+    }
+    if(cnt ==4)return 0;
+    else if(cnt ==3) return x ==1;
+    else if(cnt ==2) return check_prime(x);
+    else if(cnt == 1)return 1;
+    else return check_prime(x);
+    
+}
+void solve(){
+    LL l, r;
+    cin >> l >> r;
+    int ans =0;
+
+    for(int i = l ; i<=r ; ++i){
+        ans += check(i);
+    }
+    cout << " " << ans;
+}
+
+int main(int argc, char const *argv[])
+{   
+    
+    ios :: sync_with_stdio(0);
+    cin.tie(0);
+    // cout.tie(0);
+    std::cout.precision(8);
+    std::cout.setf( std::ios::fixed, std:: ios::floatfield );
+    int T;
+    cin >> T;
+    
+    for(int kase =1;  kase <= T ; ++kase)
+    {   
+        cout << "Case #"<<kase << ":";
+
+        solve();
+        cout << '\n';
+    }
+
+    return 0;
+}