Official
B - Multiple of 9 Editorial by evima
(This editorial is a mirror of kyopro_friends’s PDF editorial.)
You are asked to input \(N\) as a string, and check if the sum of the digits is a multiple of \(9\).
Sample Code in C
char s[200010];
int main(){
scanf("%s",s);
int len=strlen(s);
int sum=0;
for(int i=0;i<len;i++)sum+=s[i]-'0';
if(sum%9==0){
puts("Yes");
}else{
puts("No");
}
}
Note that, in languages that can handle with multiple-length integer like Python, it may be directly judged whether \(N\) is a multiple of \(9\) or not.
Sample code in Python
N=int(input())
if N%9 == 0:
print("Yes")
else:
print("No")
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