diff --git a/TangDou/LuoGuBook/TestC.cpp b/TangDou/LuoGuBook/TestC.cpp
index a545d88..e0e6380 100644
--- a/TangDou/LuoGuBook/TestC.cpp
+++ b/TangDou/LuoGuBook/TestC.cpp
@@ -16,22 +16,21 @@ int main() {
 
     for (int i = 1; i <= n; i++) {
         X.push_back(a[i].x);
-        X.push_back(a[i].x - L);
+        X.push_back(a[i].x - L); // 所有可能的左上角起点坐标(x,y) 必然满足x in X,y in Y
         Y.push_back(a[i].y);
         Y.push_back(a[i].y - L);
     }
 
-    for (int i = 0; i < X.size(); i++) {
-        for (int j = 0; j < Y.size(); j++) {
+    for (int i = 0; i < X.size(); i++)
+        for (int j = 0; j < Y.size(); j++) { // 枚举每个可能的左上角坐标
             int cnt = 0;
-            int lx = X[i], ly = Y[j];
-            for (int k = 1; k <= n; k++)
-                if (a[k].x >= lx && a[k].x <= lx + L && a[k].y >= ly && a[k].y <= ly + L)
+            int x = X[i], y = Y[j];
+            for (int k = 1; k <= n; k++) // 枚举每个金矿
+                if (a[k].x >= x && a[k].x <= x + L && a[k].y >= y && a[k].y <= y + L)
                     cnt++;
 
             ans = max(ans, cnt);
         }
-    }
 
     cout << ans << endl;