How to Handle the Fans

problem statement is here

#include<stdio.h>
#include<string.h>
long long n,br[1000000]={0};
long long int add(long long i,long long b){
while(i<=n){
br[i]+=b;
i=i+(i&((-1)*i));
}
}
long long find(long long i){
long long s=0;
while(i>0){
s+=br[i];
i=i-(i&((-1)*i));
}
return s;
}
int main(){
char ar[100];
long long a,b,c,d,i,j,t,u=0,ans,q;
scanf("%lld %lld",&n,&q);
while(q--){
scanf("%s %lld %lld",ar,&a,&b);
if(ar[0]=='a'){
add(a,b);
}else if(ar[0]=='f'){
if(a>1)
d=find(b)-find(a-1);
else
d=find(b);
printf("%lld\n",d);
}
}
return 0;
}