new file: P3370.cpp

P3370.cpp

@@ -0,0 +1,16 @@
+#include<bits/stdc++.h>
+using namespace std;
+int n;
+unordered_map<string, int> m;
+int main() {
+    scanf("%d", &n);
+    for(int i = 1; i <= n; ++i) {
+        string s;
+        cin >> s;
+        m[s]++;
+    }
+    int ans = 0;
+    for(auto a:m) ans++;
+    printf("%d\n", ans);
+    return 0;
+}