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Create SamAndSubstring.cpp

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	`1`	`+/Hackerrank problem "sam and substring"/`
	`2`	`+`
	`3`	`+int substrings(string n) {`
	`4`	`+`
	`5`	`+long long total_sum = n[0]-'0';`
	`6`	`+long long last_value = n[0] - '0';`
	`7`	`+`
	`8`	`+for(int i=1; i<n.length(); i++){`
	`9`	`+ last_value = ((last_value10)+((n[i]-'0')(i+1)))%1000000007;`
	`10`	`+ total_sum = (total_sum + last_value)%1000000007;`
	`11`	`+}`
	`12`	`+return total_sum;`
	`13`	`+}`
	`14`	`+`
	`15`	`+`

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