제출 #467860

#제출 시각아이디문제언어결과실행 시간메모리
467860rainliofficialKnapsack (NOI18_knapsack)C++17
0 / 100
2 ms388 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; struct Item{ int v, w, k; bool operator<(const Item& o) const{ return o.v < v; }; }; const int MAXN = 1e5 + 5, MAXS = 2000 + 5; int maxW, n; map<int, vector<Item>> arr; ll dp[MAXS][MAXS]; int main(){ cin.tie(0)->sync_with_stdio(0); freopen("file.in", "r", stdin); cin >> maxW >> n; for (int i=0; i<n; i++){ int v, w, k; cin >> v >> w >> k; if (arr.find(w) == arr.end()){ arr.insert({w, vector<Item>()}); } arr[w].push_back({v, w, k}); } int weightGroup = 1; for (auto currW : arr){ vector<Item> curr = currW.second; sort(curr.begin(), curr.end()); int id = 0; for (int i=0; i<=maxW; i++){ dp[weightGroup][i] = dp[weightGroup-1][i]; int sum = 0; // Try to use as many of this current weightGroup as possible int copies = 0; int ind = 0; int totCopies = 1; while (ind < curr.size()){ if (totCopies * currW.first > i){ break; } if (copies >= curr[ind].k){ ind++; copies = 0; } if (ind >= curr.size()){ break; } sum += curr[ind].v; dp[weightGroup][i] = max(dp[weightGroup][i], dp[weightGroup-1][i - totCopies * currW.first] + sum); copies++; totCopies++; } } weightGroup++; } /*for (int i=1; i<weightGroup; i++){ for (int j=0; j<=maxW; j++){ cout << dp[i][j] << " "; } cout << "\n"; }*/ ll ans = 0; for (int i=0; i<=maxW; i++){ ans = max(ans, dp[weightGroup-1][i]); } cout << ans << '\n'; }

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'int main()':
knapsack.cpp:41:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Item>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |             while (ind < curr.size()){
      |                    ~~~~^~~~~~~~~~~~~
knapsack.cpp:49:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Item>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |                 if (ind >= curr.size()){
      |                     ~~~~^~~~~~~~~~~~~~
knapsack.cpp:33:13: warning: unused variable 'id' [-Wunused-variable]
   33 |         int id = 0;
      |             ^~
knapsack.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen("file.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...