Submission #549706

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
549706	2022-04-16T10:51:48 Z	yoavL	Boat (APIO16_boat)	C++14	Compilation error	0 ms	0 KB

boat

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <queue>
#include <stack>
#include <bitset>
#include <math.h>
#include <fstream>
#include <iomanip>
#include <functional>
#include <numeric>
#include <chrono>
#include <random>

using namespace std;

//using ll = long long;
using ll = __int128_t;
using ld = long double;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vvvvll = vector<vvvll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvvb = vector<vvb>;
using vld = vector<ld>;
using vvld = vector<vld>;
using vstr = vector<string>;
using pll = pair<ll, ll>;
using vpll = vector<pll>;
using vvpll = vector<vpll>;
using pb = pair<bool, bool>;
using vpb = vector<pb>;
using vvpb = vector<vpb>;
using vi = vector<int>;
using vvi = vector<vi>;
using pi = pair<int, int>;
using vpi = vector<pi>;

const ll inf = (ll)5e9;
const ll mod = (ll)(1e9 + 7);

#define FAST        ios_base::sync_with_stdio(0)
#define FASTIN		cin.tie(0)
#define FASTOUT		cout.tie(0)

#define upmin(a, b) (a) = min((a), (b))
#define upmax(a, b) (a) = max((a), (b))

#define pr(x) cout << x << endl
#define prv(v) for(auto it : v) cout << it << " "; cout << endl;
#define prvv(v) for(auto it : v) { for(auto it2 : it) cout << it2 << " "; cout << endl; } cout << endl;
#define spr(x) cout << x << " "

//#define DBG_FLAG (1) // toggle to switch between bebug mode and solution mode
#ifdef DBG_FLAG
#define wpr(x) cout << #x << " = " << (x) << endl;
#define wprv(v) cout << #v << ": " << endl; for(auto it : v) cout << it << " "; cout << endl;
#define wprvv(v) cout << #v << ": " << endl; for(auto it : v) { for(auto it2 : it) cout << it2 << " "; cout << endl; } cout << endl;
#define wspr(x) cout << #x << ": " << x << " "
#endif

#ifndef DBG_FLAG
#define wpr(x)
#define wprv(v)
#define wprvv(v)
#define wspr(x)
#endif

#define rep(i, s, e) for(ll i = s; i < e; i++)
#define all(x) (x).begin(), (x).end()
#define pb push_back

const ll maxV = 1e6;


/*

Solution:

We've seen a slow solution so far:
We start with: [1, 0, 0, 0, ...]
And then each time we increase the current segment with all the values smaller than it.
If we make point compression, we'll get disinct segments. Shouldn't be too complicated.

*/


ll n;
vector<long long> a, b;
//vll dp;
//map<ll, ll> dp;
vll v;
void solve()
{
	cin >> n;
	a.resize(n), b.resize(n), v.resize(3 * n);
	rep(i, 0, n) {
		cin >> a[i] >> b[i];
		v[3 * i] = a[i], v[3 * i + 1] = b[i], v[3*i + 2] = b[i] + 1;
	}
	v.push_back(0);
	v.push_back(1);
	v.push_back(inf);
	sort(v.begin(), v.end());
	v.erase(unique(v.begin(), v.end()), v.end());
	wprv(v);
	rep(i, 0, n) {
		a[i] = lower_bound(v.begin(), v.end(), a[i]) - v.begin();
		b[i] = lower_bound(v.begin(), v.end(), b[i]) - v.begin();
	}
	wprv(a); wprv(b);
	vll dp(v.size(), 0);
	dp[0] = 1;
	wprv(dp);
	rep(i, 0, n) {
		ll sum = 0;
		rep(j, 0, a[i]) {
			sum += (dp[j] * (v[j+1] - v[j])) % mod;
			sum %= mod;
		}
 		wpr(sum);
		rep(j, a[i], b[i] + 1) {
			wpr(j);
			ll add = dp[j] * (v[j+1] - v[j]);
			dp[j] = (dp[j] + sum) % mod;
			sum += add;
			sum %= mod;
		}
		wprv(dp);
	}
	ll ans = 0;
	
	rep(i, 0, dp.size()-(ll)1) {
		ans = (ans + dp[i] * (v[i+1] - v[i])) % mod;
	}
	
	/*
	for (const auto& it : dp) {
		ans = (ans + it.second) % mod;
	}
	*/
	ans = (ans - 1 + mod) % mod;
	pr((long long)ans);
}


int main()
{
	FAST;
	FASTIN; FASTOUT;
	solve();
}


/*

2
1 2
2 3

2
1 5
4 9



2
2 2
2 2
// 2


*/

Compilation message

boat.cpp: In function 'void solve()':
boat.cpp:103:6: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'll' {aka '__int128'})
  103 |  cin >> n;
      |  ~~~ ^~ ~
      |  |      |
      |  |      ll {aka __int128}
      |  std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:120:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  120 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/10/istream:120:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: invalid conversion from 'll' {aka '__int128'} to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
  103 |  cin >> n;
      |         ^
      |         |
      |         ll {aka __int128}
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:124:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]' (near match)
  124 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/10/istream:124:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: invalid conversion from 'll' {aka '__int128'} to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'} [-fpermissive]
  103 |  cin >> n;
      |         ^
      |         |
      |         ll {aka __int128}
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:131:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  131 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/usr/include/c++/10/istream:131:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: invalid conversion from 'll' {aka '__int128'} to 'std::ios_base& (*)(std::ios_base&)' [-fpermissive]
  103 |  cin >> n;
      |         ^
      |         |
      |         ll {aka __int128}
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:168:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  168 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:168:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of type 'bool'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:172:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  172 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/10/istream:172:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'short int&' to an rvalue of type 'short int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:175:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  175 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:175:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to an rvalue of type 'short unsigned int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:179:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  179 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/10/istream:179:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:182:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  182 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:182:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'unsigned int&' to an rvalue of type 'unsigned int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:186:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  186 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:186:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'long int&' to an rvalue of type 'long int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:190:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  190 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:190:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to an rvalue of type 'long unsigned int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:195:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  195 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:195:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'long long int&' to an rvalue of type 'long long int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:199:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to an rvalue of type 'long long unsigned int'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:214:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  214 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/10/istream:214:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'float&' to an rvalue of type 'float'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:218:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  218 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/10/istream:218:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of type 'double'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:222:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  222 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/10/istream:222:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: cannot bind non-const lvalue reference of type 'long double&' to an rvalue of type 'long double'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:235:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  235 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/10/istream:235:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: invalid conversion from 'll' {aka '__int128'} to 'void*' [-fpermissive]
  103 |  cin >> n;
      |         ^
      |         |
      |         ll {aka __int128}
boat.cpp:103:9: error: cannot bind rvalue '(void*)((long int)n)' to 'void*&'
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:259:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]' (near match)
  259 |       operator>>(__streambuf_type* __sb);
      |       ^~~~~~~~
/usr/include/c++/10/istream:259:7: note:   conversion of argument 1 would be ill-formed:
boat.cpp:103:9: error: invalid conversion from 'll' {aka '__int128'} to 'std::basic_istream<char>::__streambuf_type*' {aka 'std::basic_streambuf<char>*'} [-fpermissive]
  103 |  cin >> n;
      |         ^
      |         |
      |         ll {aka __int128}
boat.cpp:103:6: note: candidate: 'operator>>(int, ll {aka __int128})' (built-in)
  103 |  cin >> n;
      |  ~~~~^~~~
boat.cpp:103:6: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'int'
In file included from /usr/include/c++/10/string:56,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/ostream:38,
                 from /usr/include/c++/10/iostream:39,
                 from boat.cpp:2:
/usr/include/c++/10/bits/basic_string.tcc:1476:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
 1476 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/usr/include/c++/10/bits/basic_string.tcc:1476:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'll' {aka '__int128'}
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/istream:991,
                 from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/bits/istream.tcc:931:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)'
  931 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/usr/include/c++/10/bits/istream.tcc:931:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   deduced conflicting types for parameter '_CharT' ('char' and 'll' {aka '__int128'})
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:756:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)'
  756 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/usr/include/c++/10/istream:756:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   cannot convert 'n' (type 'll' {aka '__int128'}) to type 'unsigned char&'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:761:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)'
  761 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/usr/include/c++/10/istream:761:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   cannot convert 'n' (type 'll' {aka '__int128'}) to type 'signed char&'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/istream:991,
                 from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/bits/istream.tcc:963:5: note: candidate: 'template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)'
  963 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/10/bits/istream.tcc:963:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   mismatched types '_CharT2*' and '__int128'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:803:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)'
  803 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/10/istream:803:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   cannot convert 'n' (type 'll' {aka '__int128'}) to type 'unsigned char*'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp:2:
/usr/include/c++/10/istream:808:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)'
  808 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/10/istream:808:5: note:   template argument deduction/substitution failed:
boat.cpp:103:9: note:   cannot convert 'n' (type 'll' {aka '__int128'}) to type 'signed char*'
  103 |  cin >> n;
      |         ^
In file included from /usr/include/c++/10/iostream:40,
                 from boat.cpp