else{
        ll mxidx = max_element(all(v)) - v.begin();
        // 1. increasing the max element
        while(v[mxidx] < 20) {
            ans.pb(mp(mxidx, mxidx));
            v[mxidx] += v[mxidx];
        }

        // 2. making the 2nd element greater than the 1st one
        while(v[0] > v[1]) {
            ans.pb(mp(1, mxidx));
            v[1] += v[mxidx];
        }

        // 3. incrementally increasing the values for the rest
        loop(i, 2, n) {
            while(v[i-1] > v[i]) {
                if(v[i-1] == 0) {               // to handle cases like [-1, -20, -1, 20]
                    ans.pb(mp(i, mxidx));
                    v[i] += v[mxidx];
                    continue;
                }
                //assert(sz(ans) <= 50);
                ans.pb(mp(i, i-1)) ;
                v[i] += v[i-1];
            }
        }
    }