Solved 4 problems on codechef long challenge

1 files changed, 31 insertions, 0 deletions

diff --git a/codechef/ComplementaryStrandInDna/main.cpp b/codechef/ComplementaryStrandInDna/main.cpp
new file mode 100644
index 0000000..d6c5804
--- /dev/null
+++ b/codechef/ComplementaryStrandInDna/main.cpp
@@ -0,0 +1,31 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+	int tt;
+	cin >> tt;
+	while(tt--){
+    int l;
+    cin >> l;
+    string s;
+    cin >> s;
+    for(int i = 0; i < s.size(); i++) {
+      if(s[i] == 'A') {
+        s[i] = 'T';
+      }
+      else if(s[i] == 'T') {
+        s[i] = 'A';
+      }
+      else if(s[i] == 'C') {
+        s[i] = 'G';
+      }
+      else if(s[i] == 'G') {
+        s[i] = 'C';
+      }
+    }
+    cout << s << endl;
+	}
+}