c++ 추가 및 py:9375 추가

.gitignore

@@ -5,3 +5,5 @@ out/
 
 venv
 .venv
+
+.ipynb_checkpoints

zeta_cpp/completed/2557.cpp

@@ -0,0 +1,6 @@
+#include<iostream>
+
+int main() {
+    std::cout<<"Hello World!";
+    return 0;
+}

zeta_python/9375.py

@@ -0,0 +1,13 @@
+TC = int(input())
+
+for _ in range(TC):
+    S = 0
+    T = {}
+    N = int(input())
+    for _ in range(N):
+        p, q = input().split()
+        if q in T:
+            T[q] += 1
+        else:
+            T[q] = 1
+    for i in range()