init commit

archive/algorithm/leetcode/7.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+/**
+ * https://leetcode-cn.com/problems/reverse-integer/description/
+ * 反转整数
+ */
+int reverse(int x)
+{
+    long long ret = 0;
+    while (x)
+    {
+        ret = x % 10 + ret * 10;
+        x /= 10;
+    }
+    if (ret <= 2147483647 && ret >= -2147483648)
+    {
+        return ret;
+    }
+    return 0;
+}
+/*
+最快的dalao解法
+int reverse(int x) {
+    int y=0;
+    while(x)
+    {
+        int temp=y;
+        y=y*10+x%10;
+        if((y-x%10)/10!=temp)
+        {
+            return 0;
+        }
+        x/=10;    
+    }
+    return y;
+}
+*/
+int main()
+{
+    int a = pow(2, 31);
+    printf("%d\n", reverse(1534236469));
+    printf("%d\n", reverse(-321));
+    printf("%d\n", reverse(-2147483648));
+    printf("%d\n", reverse(32006));
+    printf("%d\n", reverse(-1563847412));
+    printf("%d\n", pow(2, 31));
+    printf("%d\n", a);
+    getchar();
+    return 0;
+}