Untitled

#include <iostream>
#include <vector>

using namespace std;
int n,q;
string s;
vector<vector<int>> tree;
vector<int> a(26,0);

int binpow (int a, int n) {
	int res = 1;
	while (n) {
		if (n & 1)
			res *= a;
		a *= a;
		n >>= 1;
	}
	return res;
}

void build (int v, int tl, int tr) {
	if (tl == tr)
		tree[v][s[tl]-'a'] = 1;
	else {
		int tm = (tl + tr) / 2;
		build (v*2, tl, tm);
		build (v*2+1, tm+1, tr);
		vector<int> a2(26);
		for (int i=0;i<26;i++){
		    a2[i]=tree[v*2][i]+tree[v*2+1][i];
		}
		tree[v] = a2;
	}
}

vector<int> get(int v, int l, int r, int ql, int qr) {
	if (ql >= r || l >= qr) {
		return a;
	}
	if (ql <= l && qr <= r) {
		return tree[v];
	}
	int m = (l + r) / 2;
	vector<int> a2 = get(2 * v, l, m, ql, qr);
	vector<int> a3=get(2 * v + 1, m, r, ql, qr);
	for (int i=0;i<26;i++){
	    a2[i]+=a3[i];
	}
	return a2;
}




int main()
{
    cin>>n>>q;
    cin>>s;
    for (int i=0;i<4*n;i++){
        tree.push_back(a);
    }
    build(1,0,n-1);
    
    //for (int i=0;i<4*n;i++){
        //for (int j=0;j<26;j++){
            //cout<<"vertex "<<i<<" letter "<<j<<" count "<<tree[i][j]<<endl;
        //}
    //}
    int p,l,r,k;
    for (int i=0;i<q;i++){
        cin>>p;
        if (p==2){
            cin>>l>>r;
            vector<int> t=get(1,l,r,0,n-1);
            
        }
    }
    return 0;
}