Language: C++

/**
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*/
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>

#define F first
#define S second
#define endl '\n'
#define deb(x) cout<<#x<<' '<<x<<endl;
#define pb push_back


#ifdef IZI_KATKA
#define int __int64_t
#else
#define int __int64_t
#endif

const long long MOD = 1e9 + 7;
const long long MAXN = 1e6 + 1;
using namespace std;

typedef long long ll;

long long readInt() {
    bool minus1 = false;
    long long result = 0;
    char ch;
    ch = getchar();
    while (true) {
        if (ch == '-') break;
        if (ch >= '0' && ch <= '9') break;
        ch = getchar();
    }
    if (ch == '-') minus1 = true; else result = ch-'0';
    while (true) {
        ch = getchar();
        if (ch < '0' || ch > '9') break;
        result = result*10 + (ch - '0');
    }
    if (minus1)
        return -result;
    else
        return result;
}

int a[MAXN];


main() {
	#ifdef IZI_KATKA
	assert(freopen("input", "r", stdin));
    assert(freopen("output", "w", stdout));
    #endif
    int n = readInt();
    for (int i = 1; i <= n; i++) {
    	a[i] = readInt();
    }
    if (a[n] != 2) {
    	cout << -1;
    	return 0;
    }
    int kek=0;
    for (int i = n - 1; i >= 1; i--) {
		///a[i+1] <= z * a[i] <= 2 * a[i + 1] - 1
		int z = a[i + 1] / a[i];
		int z1 = (2 * a[i + 1] - 1) / a[i];
		bool ok = 0;
		for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
			if (a[i + 1] <= j * a[i] && j * a[i] <= 2 * a[i + 1] - 1) {
				kek = j;
				ok = 1;			
				break;
			}
		}
		
		if (!ok) {
			cout << -1;
			return 0;
		}
    }
    cout << kek * a[1] << ' ' << (kek + 1) * a[1] - 1;
    return 0;
}

Compiler output:
a.cc:70:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   70 | main() {
      | ^~~~
a.cc: In function 'int main()':
a.cc:89:33: error: no matching function for call to 'max(int, __int64_t)'
   89 |                 for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
      |                              ~~~^~~~~~~~~~
In file included from /usr/include/c++/14/vector:62,
                 from a.cc:5:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:89:33: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__int64_t' {aka 'long int'})
   89 |                 for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
      |                              ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:12:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:89:33: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   89 |                 for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
      |                              ~~~^~~~~~~~~~
a.cc:89:53: error: no matching function for call to 'max(int, __int64_t)'
   89 |                 for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
      |                                                  ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:89:53: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__int64_t' {aka 'long int'})
   89 |                 for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
      |                                                  ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:89:53: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   89 |                 for (int j = max(1, z - 1); j <= max(1, z1 + 1); j++) {
      |                                                  ~~~^~~~~~~~~~~