Sledding

input/code.cpp: In function 'int main()':
input/code.cpp:40:19: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare]
   40 |     for(int i=0; i<n; i++){
      |                  ~^~

#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;

tuple<ull,ull,ull> longest(const vector<ull>& as){
    ull bs=0, be=0, bl=0;
    ull s=0, e=0, l=0;
    for(size_t i=1; i<as.size(); i++){
        if(as[i] >= as[i-1]){
            l = as[i] - as[s];
            e = i;
            // cout << "here " << s << " " << e << " " << l << endl;
        }
        else{
            if(l > bl){
                bl = l;
                be = e;
                bs = s;
            }
            s = i;
            e = i+1;
            l = 0;
        }
    }
    if(l > bl){
        bl = l;
        be = e;
        bs = s;
    }
    // cout << "l: " << bl << " " << bs << " " << be << endl;
    return {bs, be, bl};
}

int main(){
    ull n;
    cin >> n;

    vector<ull> as;
    as.reserve(n);
    for(int i=0; i<n; i++){
        ull a;
        cin >> a;
        as.push_back(a);
    }

    auto[a1,b1,l1] = longest(as);
    auto[a2,b2,l2] = longest(vector<ull>(as.rbegin(), as.rend()));

    // cout << "this: " << l1 << " " << l2 << endl;
    if(l1 > l2){
        cout << (a1+1) << " " << (b1+1) << endl;
    }
    else{
        cout << (n - b2) << " " << (n - a2) << endl;
    }
    return 0;

    // int bs=-1, be=-1, bl=-1;
    // int s=0, e=0, l=0;
    // int dir=1;

    // auto check = [&](){
    //     if(l > bl){
    //         bs = s;
    //         be = e;
    //         bl = l;
    //     }
    // };

    // ull prev=0;
    // cin >> prev;
    // for(ull i=0; i<n; i++){
    //     ull a;
    //     cin >> a;
    //     if(i == 0){
    //         dir = (a > prev);
    //         e++;
    //         l += (dir ? a-prev : prev - a);
    //     }
    //     else if(dir){
    //         if(a > prev){
    //             e++;
    //             l+=(a - prev);
    //         }
    //         else{
    //             check();
    //             s = i;
    //             e = i;
    //             l = 0;
    //         }
    //     }
    //     else{
    //         if(a < prev){
    //             e++;
    //             l+=(prev -a);
    //         }
    //         else{
    //             check();
    //             s = i;
    //             e = i;
    //             l = 0;
    //         }
    //     }
    //     prev = a;
    // }
    // check();

    // cout << bs << " " << be << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED

Test 31

Verdict: ACCEPTED

Test 32

Verdict: ACCEPTED

Test 33

Verdict: ACCEPTED

Test 34

Verdict: ACCEPTED

Test 35

Verdict: ACCEPTED

Test 36

Verdict: ACCEPTED

Test 37

Verdict: ACCEPTED

Test 38

Verdict: ACCEPTED

Test 39

Verdict: ACCEPTED

Test 40

Verdict: ACCEPTED

Test 41

Verdict: ACCEPTED

Test 42

Verdict: ACCEPTED

Test 43

Verdict: ACCEPTED

Test 44

Verdict: ACCEPTED

Test 45

Verdict: ACCEPTED

Test 46

Verdict: ACCEPTED

Test 47

Verdict: ACCEPTED

Test 48

Verdict: ACCEPTED

Test 49

Verdict: ACCEPTED

Test 50

Verdict: ACCEPTED

Test 51

Verdict: ACCEPTED

Test 52

Verdict: ACCEPTED

Test 53

Verdict: ACCEPTED

Test 54

Verdict: ACCEPTED

Test 55

Verdict: ACCEPTED

Test 56

Verdict: ACCEPTED

Test 57

Verdict: ACCEPTED

Test 58

Verdict: ACCEPTED

Test 59

Verdict: ACCEPTED

Test 60

Verdict: ACCEPTED

Test 61

Verdict: ACCEPTED

Test 62

Verdict: ACCEPTED

Test 63

Verdict: ACCEPTED

Test 64

Verdict: ACCEPTED

Test 65

Verdict: ACCEPTED

Test 66

Verdict: ACCEPTED

Test 67

Verdict: ACCEPTED