#include<algorithm>
#include<bitset>
#include<cmath>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<deque>
#include<fstream>
#include<iomanip>
#include<iostream>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<unordered_map>
#include<unordered_set>
#include<utility>
#include<vector>

using namespace std;

#define dbg(x) (cout<<#x<<" = "<<(x)<<'\n')
#ifdef HOME
const string inputFile = "input.txt";
const string outputFile = "output.txt";
#else
const string problemName = "aib";
const string inputFile = problemName + ".in";
const string outputFile = problemName + ".out";
#endif // HOME

typedef long long int lld;
typedef pair<int, int> PII;
typedef pair<int, lld> PIL;
typedef pair<lld, int> PLI;
typedef pair<lld, lld> PLL;

const int INF = (1LL << 31) - 1;
const lld LINF = (1LL << 62) - 1;
const int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};
const int dy[] = {0, 1, 0, -1, 1, -1, -1, 1};
const int MOD = (int)(1e9) + 7;

const int NMAX = 100000 + 5;
const int MMAX = 100000 + 5;
const int KMAX = 100000 + 5;
const int PMAX = 100000 + 5;
const int LMAX = 100000 + 5;
const int VMAX = 100000 + 5;

int N, M;
int AIB[2 * NMAX];

void update(int i, int x) {
    for(; i <= N; i += i & (-i))
        AIB[i] += x;
}

int query(int i) {
    int ans = 0;
    for(; i; i -= i & (-i))
        ans += AIB[i];
    return ans;
}

int bs(int sum) {
    int lo = 1, hi = N, mi, q;

    while(lo <= hi) {
        mi = (lo + hi) / 2;
        q = query(mi);

        if(q < sum)
            lo = mi + 1;

        if(q == sum)
            return mi;

        if(q > sum)
            hi = mi - 1;
    }

    return -1;
}

int main() {
    int i, t, x, y;

#ifndef ONLINE_JUDGE
    freopen(inputFile.c_str(), "r", stdin);
    freopen(outputFile.c_str(), "w", stdout);
#endif

    scanf("%d%d", &N, &M);

    for(i = 1; i <= N; i++) {
        scanf("%d", &x);
        update(i, x);
    }

    while(M--) {
        scanf("%d", &t);

        if(t == 0) {
            scanf("%d%d", &x, &y);
            update(x, y);
        } else if(t == 1) {
            scanf("%d%d", &x, &y);
            printf("%d\n", query(y) - query(x - 1));
        } else {
            scanf("%d", &x);
            printf("%d\n", bs(x));
        }
    }

    return 0;
}