Submission #889094

#	Time	Username	Problem	Language	Result	Execution time	Memory
889094		aykhn	Wall (IOI14_wall)	C++17	Compilation error	0 ms	0 KiB

wall

```#include "wall.h"
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/* DEFINES */
#define S second
#define F first
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define ANDROID                   \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll N = 2e6 + 5;
pp(ll, ll) lazy[N << 2], ans[N];
void push(ll v)
{
    if (lazy[v] == mpr(0ll, (ll)1e9))
        return;
    if (lazy[v].F > lazy[v << 1].S)
        lazy[v << 1] = {lazy[v].F, lazy[v].F};
    elif (lazy[v].S < lazy[v << 1].F)
        lazy[v << 1] = {lazy[v].S, lazy[v].S};
    else
        lazy[v << 1].F = max(lazy[v].F, lazy[v << 1].F), lazy[v << 1].S = min(lazy[v << 1].S, lazy[v].S);
    if (lazy[v].F > lazy[v << 1 | 1].S)
        lazy[v << 1 | 1] = {lazy[v].F, lazy[v].F};
    elif (lazy[v].S < lazy[v << 1 | 1].F)
        lazy[v << 1 | 1] = {lazy[v].S, lazy[v].S};
    else
        lazy[v << 1 | 1].F = max(lazy[v].F, lazy[v << 1 | 1].F), lazy[v << 1 | 1].S = min(lazy[v << 1 | 1].S, lazy[v].S);
    lazy[v] = {0ll, (ll)1e9};
}
void modifymin(ll i, ll j, ll val, ll l, ll r, ll v)
{push(v);
    if (max(i, l) > min(j, r))
        return;
    if (i <= l and r <= j)
    {
        // lazy[v].S = min(lazy[v].S, val);
        // if (lazy[v].F > lazy[v].S)
        //     lazy[v].F = lazy[v].S;
        lazy[v] = {(ll)0, val};
        push(v);
        return;
    }
    ll mid = (l + r) >> 1;
    modifymin(i, j, val, l, mid, v << 1);
    modifymin(i, j, val, mid + 1, r, v << 1 | 1);
}
void modifymax(ll i, ll j, ll val, ll l, ll r, ll v)
{push(v);
    if (max(i, l) > min(j, r))
        return;
    if (i <= l and r <= j)
    {
        // lazy[v].F = max(lazy[v].F, val);
        // if (lazy[v].F > lazy[v].S)
        //     lazy[v].S = lazy[v].F;
        lazy[v] = {val, (ll)1e9};
        push(v);
        return;
    }
    ll mid = (l + r) >> 1;
    modifymax(i, j, val, l, mid, v << 1);
    modifymax(i, j, val, mid + 1, r, v << 1 | 1);
}
void build(ll l, ll r, ll v)
{
    if (l == r)
    {
        ans[l] = lazy[v];
        return;
    }
    ll mid = (l + r) >> 1;
    push(v);
    build(l, mid, v << 1);
    build(mid + 1, r, v << 1 | 1);
}
void init(ll l, ll r, ll v)
{
    if (l == r)
    {
        lazy[l] = {0, 0};
        return;
    }
    ll mid = (l + r) >> 1;
    build(l, mid, v << 1);
    build(mid + 1, r, v << 1 | 1);
}
void buildWall(int n, int k, int op[], int left[], int right[], int height[], int finalHeight[])
{
    for (ll i = 0; i <= (n << 2); i++)
        lazy[i] = mpr(0, 1e9);
    init(0, n - 1, 1);
    for (ll i = 0; i < k; i++)
        if (op[i] == 1)
            modifymax(left[i], right[i], height[i], 0, n - 1, 1);
        else
            modifymin(left[i], right[i], height[i], 0, n - 1, 1);
    build(0, n - 1, 1);
    for (ll i = 0; i < n; i++)
        finalHeight[i] = ans[i].F;
}

Compilation message (stderr)

wall.cpp:1:1: error: stray '`' in program
    1 | ```#include "wall.h"
      | ^
wall.cpp:1:2: error: stray '`' in program
    1 | ```#include "wall.h"
      |  ^
wall.cpp:1:3: error: stray '`' in program
    1 | ```#include "wall.h"
      |   ^
wall.cpp:1:4: error: stray '#' in program
    1 | ```#include "wall.h"
      |    ^
wall.cpp:1:5: error: 'include' does not name a type
    1 | ```#include "wall.h"
      |     ^~~~~~~
In file included from /usr/include/c++/10/cmath:43,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/ext/type_traits.h:162:35: error: 'bool __gnu_cxx::__is_null_pointer' redeclared as different kind of entity
  162 |   __is_null_pointer(std::nullptr_t)
      |                                   ^
/usr/include/c++/10/ext/type_traits.h:157:5: note: previous declaration 'template<class _Type> bool __gnu_cxx::__is_null_pointer(_Type)'
  157 |     __is_null_pointer(_Type)
      |     ^~~~~~~~~~~~~~~~~
/usr/include/c++/10/ext/type_traits.h:162:26: error: 'nullptr_t' is not a member of 'std'
  162 |   __is_null_pointer(std::nullptr_t)
      |                          ^~~~~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:402:26: error: 'std::size_t' has not been declared
  402 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/10/type_traits:403:25: error: '_Size' was not declared in this scope
  403 |     struct is_array<_Tp[_Size]>
      |                         ^~~~~
/usr/include/c++/10/type_traits:403:31: error: template argument 1 is invalid
  403 |     struct is_array<_Tp[_Size]>
      |                               ^
/usr/include/c++/10/type_traits:508:42: error: 'nullptr_t' is not a member of 'std'
  508 |     struct __is_null_pointer_helper<std::nullptr_t>
      |                                          ^~~~~~~~~
/usr/include/c++/10/type_traits:508:51: error: template argument 1 is invalid
  508 |     struct __is_null_pointer_helper<std::nullptr_t>
      |                                                   ^
/usr/include/c++/10/type_traits:1351:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1351 |     : public integral_constant<std::size_t, alignof(_Tp)>
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1351:57: error: template argument 1 is invalid
 1351 |     : public integral_constant<std::size_t, alignof(_Tp)>
      |                                                         ^
/usr/include/c++/10/type_traits:1351:57: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1360:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1360 |     : public integral_constant<std::size_t, 0> { };
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1360:46: error: template argument 1 is invalid
 1360 |     : public integral_constant<std::size_t, 0> { };
      |                                              ^
/usr/include/c++/10/type_traits:1360:46: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1362:26: error: 'std::size_t' has not been declared
 1362 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/10/type_traits:1363:21: error: '_Size' was not declared in this scope
 1363 |     struct rank<_Tp[_Size]>
      |                     ^~~~~
/usr/include/c++/10/type_traits:1363:27: error: template argument 1 is invalid
 1363 |     struct rank<_Tp[_Size]>
      |                           ^
/usr/include/c++/10/type_traits:1364:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1364 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1364:65: error: template argument 1 is invalid
 1364 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                                                 ^
/usr/include/c++/10/type_traits:1364:65: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1368:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1368 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1368:65: error: template argument 1 is invalid
 1368 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                                                 ^
/usr/include/c++/10/type_traits:1368:65: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1373:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1373 |     : public integral_constant<std::size_t, 0> { };
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1373:46: error: template argument 1 is invalid
 1373 |     : public integral_constant<std::size_t, 0> { };
      |                                              ^
/usr/include/c++/10/type_traits:1373:46: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1375:42: error: 'std::size_t' has not been declared
 1375 |   template<typename _Tp, unsigned _Uint, std::size_t _Size>
      |                                          ^~~
/usr/include/c++/10/type_traits:1376:23: error: '_Size' was not declared in this scope
 1376 |     struct extent<_Tp[_Size], _Uint>
      |                       ^~~~~
/usr/include/c++/10/type_traits:1376:36: error: template argument 1 is invalid
 1376 |     struct extent<_Tp[_Size], _Uint>
      |                                    ^
/usr/include/c++/10/type_traits:1377:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1377 |     : public integral_constant<std::size_t,
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1378:24: error: '_Size' was not declared in this scope
 1378 |           _Uint == 0 ? _Size : extent<_Tp,
      |                        ^~~~~
/usr/include/c++/10/type_traits:1379:28: error: template argument 1 is invalid
 1379 |           _Uint - 1>::value>
      |                            ^
/usr/include/c++/10/type_traits:1379:28: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1384:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1384 |     : public integral_constant<std::size_t,
      |                                     ^~~~~~
In file included from /usr/include/stdlib.h:31,
                 from /usr/include/c++/10/bits/std_abs.h:38,
                 from /usr/include/c++/10/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:209:23: note: 'size_t' declared here
  209 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/type_traits:1386:31: error: template argument 1 is invalid
 1386 |              _Uint - 1>::value>
      |                               ^
/usr/include/c++/10/type_traits:1386:31: note: invalid template non-type parameter
/usr/include/c++/10/type_traits:1975:26: error: 'std::size_t' has not been declared
 1975 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/10/type_traits:1976:30: error: '_Size' was not declared in this scope
 1976 |     struct remove_extent<_Tp[_Size]>
      |                              ^~~~~
/usr/include/c++/10/type_traits:1976:36: error: template argument 1 is invalid
 1976 |     struct remove_extent<_Tp[_Size]>
      |                                    ^
/usr/include/c++/10/type_traits:1988:26: error: 'std::size_t' has not been declared
 1988 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/10/type_traits:1989:35: error: '_Size' was not declared in this scope
 1989 |     struct remove_all_extents<_Tp[_Size]>
      |                                   ^~~~~
/usr/include/c++/10/type_traits:1989:41: error: template argument 1 is invalid
 1989 |     struct remove_all_extents<_Tp[_Size]>
      |                                         ^
/usr/include/c++/10/type_traits:2047:12: error: 'std::size_t' has not been declared
 2047 |   template<std::size_t _Len>
      |            ^~~
/usr/include/c++/10/type_traits:2052:23: error: '_Len' was not declared in this scope
 2052 |  unsigned char __data[_Len];
      |                       ^~~~
/usr/include/c++/10/type_traits:2067:12: error: 'std::size_t' has not been declared
 2067 |   template<std::size_t _Len, std::size_t _Align =
      |            ^~~
/usr/include/c++/10/type_traits:2067:30: error: 'std::size_t' has not been declared
 2067 |   template<std::size_t _Len, std::size_t _Align =
      |                              ^~~
/usr/include/c++/10/type_traits:2068:48: error: '_Len' was not declared in this scope
 2068 |     __alignof__(typename __aligned_storage_msa<_Len>::__type)>
      |                                                ^~~~
/usr/include/c++/10/type_traits:2068:52: error: template argument 1 is invalid
 2068 |     __alignof__(typename __aligned_storage_msa<_Len>::__type)>
      |                                                    ^
/usr/include/c++/10/type_traits:2073:23: error: '_Len' was not declared in this scope
 2073 |  unsigned char __data[_Len];
      |                       ^~~~
/usr/include/c++/10/type_traits:2074:37: error: '_Align' was not declared in this scope
 2074 |  struct __attribute__((__aligned__((_Align)))) { } __align;
      |                                     ^~~~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/bits/stl_pair.h:92:12: error: 'std::size_t' has not been declared
   92 |   template<std::size_t...>
      |            ^~~
/usr/include/c++/10/bits/stl_pair.h:449:36: error: 'std::size_t' has not been declared
  449 |       template<typename... _Args1, std::size_t... _Indexes1,
      |                                    ^~~
/usr/include/c++/10/bits/stl_pair.h:450:36: error: 'std::size_t' has not been declared
  450 |                typename... _Args2, std::size_t... _Indexes2>
      |                                    ^~~
/usr/include/c++/10/bits/stl_pair.h:453:27: error: '_Indexes1' was not declared in this scope
  453 |              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
      |                           ^~~~~~~~~
/usr/include/c++/10/bits/stl_pair.h:453:36: error: expected parameter pack before '...'
  453 |              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
      |                                    ^~~
/usr/include/c++/10/bits/stl_pair.h:453:39: error: template argument 1 is invalid
  453 |              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
      |                                       ^
/usr/include/c++/10/bits/stl_pair.h:453:55: error: '_Indexes2' was not declared in this scope
  453 |              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
      |                                                       ^~~~~~~~~
/usr/include/c++/10/bits/stl_pair.h:453:64: error: expected parameter pack before '...'
  453 |              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
      |                                                                ^~~
/usr/include/c++/10/bits/stl_pair.h:453:67: error: template argument 1 is invalid
  453 |              _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
      |                                                                   ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:65,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/bits/stl_iterator_base_types.h:125:67: error: 'ptrdiff_t' does not name a type
  125 |   template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
      |                                                                   ^~~~~~~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:65,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/usr/include/c++/10/bits/stl_iterator_base_types.h:1:1: note: 'ptrdiff_t' is defined in header '<cstddef>'; did you forget to '#include <cstddef>'?
  +++ |+#include <cstddef>
    1 | // Types used in iterator implementation -*- C++ -*-
In file included from /usr/include/c++/10/bits/stl_algobase.h:65,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from wall.cpp:5:
/u