Submission #1049619

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049619		LittleOrange	The Big Prize (IOI17_prize)	C++17	Compilation error	0 ms	0 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>
using namespace std;
using ll = int;
int find_best(int n) {
	mt19937_64 mt(random_device{}());
	vector<array<ll,2>> mem(n,{-1,-1});
	auto qry = [&](ll i){
		if (mem[i][0]==-1){
			auto a = ask(i);
			mem[i] = {a[0],a[1]};
		}
		return mem[i];
	};
	ll cnt = 449;
	vector<ll> a(n);
	iota(a.begin(),a.end(),0);
	shuffle(a.begin(),a.end(),mt);
	ll mx = 0;
	for(ll i = 0;i<cnt;i++){
		mx = max(mx,qry(a[i]));
	}
	ll ans = -1;
	function<void(ll,ll,ll,ll)> dfs;
	dfs = [&](ll l, ll r,ll dl, ll dr){
		if (ans != -1) return;
		if (l == r){
			ans = l;
			return;
		}
		array<ll,2> o = {-1,-1};
		ll m = l+r>>1;
		while(o[0]+o[1]!=0&&o[0]+o[1]!=mx){
			m = l+mt()%(r-l+1);
			o = qry(m);
		}
		if (o[0]+o[1]==0) {
			ans = m;
			return;
		}
		if (o[0]-dl>0){
			dfs(l,m-1,dl,o[1]);
		}
		if(o[1]-dr>0){
			dfs(m+1,r,o[0],dr);
		}
	};
	dfs(0,n-1,0,0);
	return ans;
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:21:24: error: no matching function for call to 'max(ll&, std::array<int, 2>)'
   21 |   mx = max(mx,qry(a[i]));
      |                        ^
In file included from /usr/include/c++/10/vector:60,
                 from prize.h:1,
                 from prize.cpp:1:
/usr/include/c++/10/bits/stl_algobase.h:254:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  254 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/10/bits/stl_algobase.h:254:5: note:   template argument deduction/substitution failed:
prize.cpp:21:24: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::array<int, 2>')
   21 |   mx = max(mx,qry(a[i]));
      |                        ^
In file included from /usr/include/c++/10/vector:60,
                 from prize.h:1,
                 from prize.cpp:1:
/usr/include/c++/10/bits/stl_algobase.h:300:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/10/bits/stl_algobase.h:300:5: note:   template argument deduction/substitution failed:
prize.cpp:21:24: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::array<int, 2>')
   21 |   mx = max(mx,qry(a[i]));
      |                        ^
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from prize.cpp:2:
/usr/include/c++/10/bits/stl_algo.h:3480:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(std::initializer_list<_Tp>)'
 3480 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/10/bits/stl_algo.h:3480:5: note:   template argument deduction/substitution failed:
prize.cpp:21:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   21 |   mx = max(mx,qry(a[i]));
      |                        ^
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from prize.cpp:2:
/usr/include/c++/10/bits/stl_algo.h:3486:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(std::initializer_list<_Tp>, _Compare)'
 3486 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/10/bits/stl_algo.h:3486:5: note:   template argument deduction/substitution failed:
prize.cpp:21:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   21 |   mx = max(mx,qry(a[i]));
      |                        ^
prize.cpp: In lambda function:
prize.cpp:32:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |   ll m = l+r>>1;
      |          ~^~