#include <cstdio>
#define MAX 100001
int V[MAX],n,m;

void update(int idx,int val){
    while(idx<=n){
        V[idx]+=val;
        idx+=idx&-idx;
    }
}

int read(int idx){
    int sum=0;
    while(idx>0){
        sum+=V[idx];
        idx-=idx&-idx;
    }
    return sum;
}

int CB(int x){
    int st,dr,md,sum;
    st=1; dr=n;
    while(dr-st>1){
        md=(st+dr)/2;
        sum=read(md);
        if(sum>x)dr=md-1; else st=md; }
    return read(st)==x?st:read(dr)==x?dr:-1;
}

int main(){
    int cod,x,y;
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
        scanf("%d %d",&n,&m);
        for(int i=1;i<=n;i++){
            scanf("%d",&x);
            update(i,x); }
        for(int i=1;i<=m;i++){
            scanf("%d",&cod);
        switch(cod){
            case 0: scanf("%d %d",&x,&y); update(x,y); break;
            case 1: scanf("%d %d",&x,&y);
                    printf("%d\n",read(y)-read(x-1)); break;
            case 2: scanf("%d",&x); printf("%d\n",CB(x)); break; }
        }
}