Create 670.cpp

LeetCode-CN/670.cpp

@@ -0,0 +1,30 @@
+class Solution {
+public:
+    int maximumSwap(int num) {
+        char buff[32];
+        snprintf(buff, 32, "%d", num);
+        int len = strlen(buff);
+        for (int i = 0; i < len - 1; i++)
+        {
+            int maxIndex = i + 1;
+            char maxChar = buff[i + 1];
+
+            for (int j = i + 2; j < len; j++)
+            {
+                if (buff[j] >= maxChar) {
+                    maxChar = buff[j];
+                    maxIndex = j;
+                }
+            }
+
+            if (buff[i] < maxChar) {
+                swap(buff[i], buff[maxIndex]);
+                break;
+            }
+        }
+
+        int result;
+        sscanf(buff, "%d", &result);
+        return result;
+    }
+};