1 files changed, 59 insertions, 0 deletions
diff --git a/codeforces/Increasing/main.cpp b/codeforces/Increasing/main.cpp
new file mode 100644
index 0000000..f2bf814
--- /dev/null
+++ b/codeforces/Increasing/main.cpp
@@ -0,0 +1,59 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+using ll = long long;
+using pi = pair<int, int>;
+using vpi = vector<pi>;
+using vi = vector<int>;
+using vll = vector<long long>;
+using mpii = map<int, int>;
+using mpll = map<ll, ll>;
+using db = long double;
+
+#define push_back pb
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+#define lb lower_bound
+#define ub upper_bound
+
+const int MOD = (int)1e9 + 7;
+const db PI = acos((db)-1);
+const int dx[4]{1, 0, -1, 0};
+const int dy[4]{0, 1, 0, -1};
+
+string solve() {
+  int n;
+  cin >> n;
+  vi v(n);
+  mpii mp;
+  for (auto &x : v) cin >> x;
+  for (auto x : v) {
+    mp[x]++;
+  }
+  for (auto x : v) {
+    if (mp[x] > 1) {
+      return "NO";
+    }
+  }
+  return "YES";
+}
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+	int tt;
+	cin >> tt;
+	while(tt--) {
+    cout << solve() << '\n';
+	}
+}
+
+/* stuff you should look for:
+  ---------------------------
+   * special cases (n=1?)
+   * int overflow, array bounds
+   * do smth instead of nothing and stay organized
+   * WRITE STUFF DOWN
+   * DON'T GET STUCK ON ONE APPROACH
+ */