4 files changed, 49 insertions, 0 deletions
diff --git a/contests/filtrationContest/A/main b/contests/filtrationContest/A/main
new file mode 100755
index 0000000..1061a17
--- /dev/null
+++ b/contests/filtrationContest/A/main
diff --git a/contests/filtrationContest/A/main.cpp b/contests/filtrationContest/A/main.cpp
new file mode 100644
index 0000000..5968cb2
--- /dev/null
+++ b/contests/filtrationContest/A/main.cpp
@@ -0,0 +1,33 @@
+#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 n;
+    cin >> n;
+    string s;
+    cin >> s;
+    bool sus = false;
+    for (int i = 0; i < n - 1; i++) {
+      if(s[i] == s[i + 1]) {
+        s[i] = '.';
+      }
+    }
+    map<int, int> fq;
+    for (auto ch : s) {
+      fq[ch]++;
+    }
+    for (auto [key, val] : fq) {
+      if (val > 1 && key != '.') {
+        sus = true;
+        break;
+      }
+    }
+    cout << (!sus ? "YES" : "NO") << '\n';
+	}
+}
diff --git a/contests/filtrationContest/A/main_input0.txt b/contests/filtrationContest/A/main_input0.txt
new file mode 100644
index 0000000..4fdafa4
--- /dev/null
+++ b/contests/filtrationContest/A/main_input0.txt
@@ -0,0 +1,11 @@
+5
+3
+ABA
+11
+DDBBCCCBBEZ
+7
+FFGZZZY
+1
+Z
+2
+AB
diff --git a/contests/filtrationContest/A/main_output0.txt b/contests/filtrationContest/A/main_output0.txt
new file mode 100644
index 0000000..7957a10
--- /dev/null
+++ b/contests/filtrationContest/A/main_output0.txt
@@ -0,0 +1,5 @@
+NO
+NO
+YES
+YES
+YES