Submission #1265790

#TimeUsernameProblemLanguageResultExecution timeMemory
1265790minggaKnapsack (NOI18_knapsack)C++20
73 / 100
1093 ms8340 KiB
// Author: caption_mingle #include "bits/stdc++.h" using namespace std; #define ln "\n" #define pb push_back #define fi first #define se second #define all(x) (x).begin(), (x).end() #define sz(x) ((int)(x).size()) #define ll long long const int mod = 1e9 + 7; const int inf = 2e9; int dp[2005]; int n, s; signed main() { cin.tie(0) -> sync_with_stdio(0); #define task "" if(fopen(task ".INP", "r")) { freopen(task ".INP", "r", stdin); freopen(task ".OUT", "w", stdout); } vector<int> W, V; cin >> s >> n; for(int i = 1; i <= n; i++) { int v, w, k; cin >> v >> w >> k; k = min(k, s / w); int cnt = 1; while(1) { if(k < cnt) break; W.pb(cnt * w); V.pb(v * cnt); k -= cnt; cnt *= 2; } if(k > 0) { W.pb(k * w); V.pb(k * v); } } for(int i = 0; i < sz(W); i++) { for(int j = s; j >= W[i]; j--) { dp[j] = max(dp[j], dp[j - W[i]] + V[i]); } } cout << * max_element(dp, dp + s + 1) << ln; cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC; }

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:22:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:23:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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