Submission #679653

#	Time	Username	Problem	Language	Result	Execution time	Memory
679653		nicolexxuu	Knapsack (NOI18_knapsack)	C++17	Compilation error	0 ms	0 KiB

knapsack

#include <bits/stdc++.h>

using namespace std;

int main() {
	int S, N;
	cin >> S >> N;
	
	map<int, vector<pair<int, int>>> by_weight;
	for(int t = 0; t < N; t++) {
		int V, W, K;
		cin >> V >> W >> K;
		by_weight[W].push_back({V, K});
	}
	
	vector<vector<int>> dp(by_weight.size()+1, vector<int>(S+1));
	
	int res = 0;
	int i = 1;
	for(auto& [w, items] : by_weight) {
		for(int s = 1; s <= S; s++) {
			dp[i][s] = dp[i-1][s];
			
			int curr_i = 0, curr_cnt = 0, val = 0;
			for(int cnt = 1; cnt * w <= s && currI < items.size(); cnt++) {
				val += items[currI].first;
				if(++currCnt == items[currI].second) {
					currCnt = 0;
					currI++;
				}
				dp[i][s] = max(dp[i][s], dp[i-1][s-cnt*w] + val);
			}
		}
		
		
		res = max(dp[i], res);
	}
	
	cout << res << endl;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:25:37: error: 'currI' was not declared in this scope; did you mean 'curr_i'?
   25 |    for(int cnt = 1; cnt * w <= s && currI < items.size(); cnt++) {
      |                                     ^~~~~
      |                                     curr_i
knapsack.cpp:27:10: error: 'currCnt' was not declared in this scope; did you mean 'curr_cnt'?
   27 |     if(++currCnt == items[currI].second) {
      |          ^~~~~~~
      |          curr_cnt
knapsack.cpp:24:8: warning: unused variable 'curr_i' [-Wunused-variable]
   24 |    int curr_i = 0, curr_cnt = 0, val = 0;
      |        ^~~~~~
knapsack.cpp:24:20: warning: unused variable 'curr_cnt' [-Wunused-variable]
   24 |    int curr_i = 0, curr_cnt = 0, val = 0;
      |                    ^~~~~~~~
knapsack.cpp:36:23: error: no matching function for call to 'max(__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> >, std::vector<int> >::value_type&, int&)'
   36 |   res = max(dp[i], res);
      |                       ^
In file included 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 knapsack.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:
knapsack.cpp:36:23: note:   deduced conflicting types for parameter 'const _Tp' ('std::vector<int>' and 'int')
   36 |   res = max(dp[i], res);
      |                       ^
In file included 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 knapsack.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:
knapsack.cpp:36:23: note:   deduced conflicting types for parameter 'const _Tp' ('std::vector<int>' and 'int')
   36 |   res = max(dp[i], res);
      |                       ^
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from knapsack.cpp:1:
/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:
knapsack.cpp:36:23: note:   'std::vector<int>' is not derived from 'std::initializer_list<_Tp>'
   36 |   res = max(dp[i], res);
      |                       ^
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from knapsack.cpp:1:
/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:
knapsack.cpp:36:23: note:   'std::vector<int>' is not derived from 'std::initializer_list<_Tp>'
   36 |   res = max(dp[i], res);
      |                       ^