0分，样例过了

#include<bits/stdc++.h>
using namespace std;
int n , m ;
char question;
int s[500005] , d[500005] , a[500005];
long long lowbit(int x){
	return x & -x;
}

void change(int x , int k){
	while(x <= n){
		s[x] += k ;
		x += lowbit(x) ;
	}
}

long long chazhao(int x){
	int sum = 0 ;
	while(x != 0){
		sum += s[x] ;
		x -= lowbit(x) ;
	}
	return sum ;
}
int main(){
	cin >> n >> m ;
	for(int i = 1 , x , a , b ; i <= m ; i ++){
		cin >> question ;
		cin >> a >> b ;
		if(question == 'x'){
			d[a] += b;
			change(a , b) ;
		}else{
			cout << chazhao(b) - chazhao(a - 1) << endl ;
		}
	}
}