Added some problems

1 files changed, 16 insertions, 0 deletions

diff --git a/cses/IntroductoryProblems/BitStrings/main.cpp b/cses/IntroductoryProblems/BitStrings/main.cpp
new file mode 100644
index 0000000..db812c5
--- /dev/null
+++ b/cses/IntroductoryProblems/BitStrings/main.cpp
@@ -0,0 +1,16 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+  int n;
+  int m = 1e9 + 7;
+  cin >> n;
+  long long ans = 0;
+  while(n--) {
+    ans += ((2 % m) * (2 % m)) % m;
+  }
+  cout << ans << '\n';
+}