update codingame challenges

Adding python challenges and sorting the challenges

C/Medium_Challenges/stock_exchange_losses.c

@@ -0,0 +1,20 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+int main()
+{
+    int n, v, max = 0, max_lost =0, curr_lost = 0; 
+    scanf("%d", &n);
+    for (int i = 0; i < n; i++) {
+        scanf("%d", &v);
+
+        curr_lost = v-max;
+        if (curr_lost < max_lost) max_lost = curr_lost;
+        if (v>max) max = v;
+    }
+    printf("%d\n",max_lost);
+
+    return 0;
+}