diff --git a/TangDou/LuoGuBook/ZhiMuSanJiaoXing.cpp b/TangDou/LuoGuBook/ZhiMuSanJiaoXing.cpp
index 6689132..e8675f5 100644
--- a/TangDou/LuoGuBook/ZhiMuSanJiaoXing.cpp
+++ b/TangDou/LuoGuBook/ZhiMuSanJiaoXing.cpp
@@ -1,20 +1,16 @@
 #include <bits/stdc++.h>
-using std::sort;
-using std::cin;
-using std::cout;
-using std::endl;
-using std::string;
+using namespace std;
 
 int n, flag, axis;
-string inStr, ans;
-struct point {
+string s, ans;
+struct Node {
     int x, y;
     char v; // value
 };
-std::vector<point> pt;
-struct point inf;
+vector<Node> pt;
+struct Node inf;
 
-bool comp(const point &a, const point &b) {
+bool comp(const Node &a, const Node &b) {
     if (a.v == b.v) {
         return (a.x == b.x) ? (a.y < b.y) : (a.x < b.x);
     } else {
@@ -22,32 +18,25 @@ bool comp(const point &a, const point &b) {
     }
 }
 int main() {
-    cin >> n >> inStr;
-    flag = 0, axis = 0;
-    for (register int count = 0; count < n; ++count) {
-        for (register int countB = 0; countB < count + 1; ++countB) {
-            point newPt;
-            newPt.v = inStr[flag];
-            newPt.y = count;
-            newPt.x = axis + (countB << 1);
+    cin >> n >> s;
+    for (int i = 0; i < n; i++) {
+        for (int j = 0; j <= i; j++) {
+            Node newPt;
+            newPt.v = s[flag];
+            newPt.y = i;
+            newPt.x = axis + (j << 1);
             ++flag;
             pt.push_back(newPt);
-            // used for debug
-            // cout<<newPt.v<<' '<<newPt.x<<' '<<newPt.y<<endl;
-            // end debug
         }
         --axis;
     }
     inf.x = (1 << 8), inf.y = (1 << 8), inf.v = '~';
     pt.push_back(inf);
     sort(pt.begin(), pt.end(), comp);
-    for (register int count = 0; count <= flag; ++count) {
+    for (int count = 0; count <= flag; ++count) {
         if (pt[count].v == '~') {
             break;
         }
-        // used for debug
-        // cout<<'*'<<pt[count].v<<' '<<pt[count-1].v<<' '<<pt[count-2].v<<endl;
-        // end debug
         if (pt[count].v != pt[count + 1].v) {
             if (pt[count - 2].v == pt[count].v) {
                 int dist[3];
@@ -57,19 +46,15 @@ int main() {
                           + 3 * (pt[count - 2].y - pt[count].y) * (pt[count - 2].y - pt[count].y);
                 dist[2] = (pt[count - 1].x - pt[count].x) * (pt[count - 1].x - pt[count].x)
                           + 3 * (pt[count - 1].y - pt[count].y) * (pt[count - 1].y - pt[count].y);
-                // used for debug
-                // cout<<'*'<<pt[count].v<<' '<<dist[0]<<' '<<dist[1]<<' '<<dist[2]<<endl;
-                // end debug
                 if (dist[1] == dist[2] && dist[0] == dist[1]) {
                     ans = ans + pt[count].v;
                 }
             }
         }
     }
-    if (ans != "") {
+    if (ans != "")
         cout << ans << endl;
-    } else {
+    else
         puts("No Solution");
-    }
     return 0;
 }
\ No newline at end of file