Dynamic Range Minimum Queries

input/code.cpp: In function 'int main()':
input/code.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare]
   11 |     for(int i=0; i<n; i++){
      |                  ~^~

#include <bits/stdc++.h>
using namespace std;

typedef unsigned long long ull;

int main(){
    ull n, q;
    std::cin >> n >> q;
    vector<ull> ns;
    ns.reserve(n);
    for(int i=0; i<n; i++){
        ull nn;
        cin >> nn;
        ns.push_back(nn);
    }

    for(ull i=0; i<q; i++){
        ull t, a, b;
        cin >> t >> a >> b;
        if(t == 1){
            ns[a-1] = b;
        }
        else{
            ull minval = *min_element(ns.begin()+(a-1), ns.begin()+(b-1));
            cout << minval << endl;
        }
    }
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: TIME LIMIT EXCEEDED