Wed, 06 Mar 2019 10:11:18 +0800

C279992/H.cpp

@@ -2,7 +2,20 @@
 #define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
 #include <bits/stdc++.h>
 using namespace std;
+using ll = long long;
+ll qpow(ll a, ll b, ll m)
+{
+    ll r = 1;
+    for (; b; b >>= 1, a = a * a % m)
+        if (b & 1)
+            r = r * a % m;
+    return r;
+}
 int main()
 {
+    int T, n;
+    scanf("%d", &T);
+    for (int t = 1; t <= T; t++)
+        scanf("%d", &n), printf("Case #%d: %lld\n", t, n * qpow(2, n - 1, 1000000007) % 1000000007);
     return 0;
 }