diff --git a/CF670C.cpp b/CF670C.cpp
new file mode 100644
index 0000000..2006603
--- /dev/null
+++ b/CF670C.cpp
@@ -0,0 +1,33 @@
+// 103
+#include <bits/stdc++.h>
+using namespace std;
+int n, m;                            // 200000
+int a[200005], b[200005], c[200005]; // bi!=ci
+map<int, int> hui;
+pair<pair<int, int>, int> happy[200005];
+bool cmp(pair<pair<int, int>, int> a, pair<pair<int, int>, int> b)
+{
+    if (a.first.first != b.first.first)
+    {
+        return a.first.first > b.first.first;
+    }
+    else
+        return a.first.second > b.first.second;
+}
+int main()
+{
+    scanf("%d", &n);
+    for (int i = 1; i <= n; ++i)
+    {
+        scanf("%d", &a[i]);
+        hui[a[i]]++;
+    }
+    scanf("%d", &m);
+    for (int i = 1; i <= m; ++i)
+        scanf("%d", &b[i]), happy[i].first.first = hui[b[i]], happy[i].second = i;
+    for (int i = 1; i <= m; ++i)
+        scanf("%d", &c[i]), happy[i].first.second = hui[c[i]];
+    sort(happy + 1, happy + m + 1, cmp);
+    printf("%d\n", happy[1].second);
+    return 0;
+}
\ No newline at end of file