Solved a couple of problems from codechef and codeforces

1 files changed, 21 insertions, 0 deletions

diff --git a/codechef/MagicalDoors/main.cpp b/codechef/MagicalDoors/main.cpp
new file mode 100644
index 0000000..91b03a6
--- /dev/null
+++ b/codechef/MagicalDoors/main.cpp
@@ -0,0 +1,21 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+	int tt;
+	cin >> tt;
+	while(tt--){
+    string s;
+    cin >> s;
+    int ans = 0, x = 0;
+    for (auto ch : s) {
+      char c = '0' + (x ^ (ch - '0'));
+      ans += (c == '0');
+      x ^= (c == '0');
+    }
+    cout << ans << '\n';
+	}
+}