GeeksForGeeks Excel Sheet Problem

An String Problem.

Author: spdpiyush

GEEKSFORGEEKS/Geeks_Excel_Sheet.c

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+//GeeksForGeeks Problem : Excel Sheet | Part -2 (Easy)
+//Author : Piyush
+#include<stdio.h>
+#include<string.h>
+#include<math.h>
+int main()
+{
+	int t,sum,i,j,l,k;
+	char str[26]={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'},str1[10];
+	scanf("%d",&t);
+	while(t--)
+	{
+		sum=0;
+		scanf("%s",str1);
+		l=strlen(str1);
+		k=0;
+		for(i=l-1;i>=0;i--)
+		{
+			for(j=0;j<26;j++)
+			{
+				if(str1[i] == str[j])
+				{
+					sum+=(j+1)*pow(26,k);
+					break;
+				}
+			}
+			k++;
+		}
+		printf("%d\n",sum);
+	}
+	return 0;
+}