제출 #1102288

#제출 시각아이디문제언어결과실행 시간메모리
1102288tuannmKnapsack (NOI18_knapsack)C++17
100 / 100
53 ms3832 KiB
#include<bits/stdc++.h> #define ii pair<int, int> #define ll pair<long long, long long> #define fi first #define se second #define pb push_back using namespace std; const int mod[2] = {1000000007, 998244353}; const int W = 2e3 + 1; const string NAME = ""; int n, s; vector<ii> item[W]; long long dp[W]; template<class X, class Y> bool maximize(X &x, const Y &y) { if (x < y) { x = y; return true; } else return false; } void inp(){ cin >> s >> n; for(int i = 1; i <= n; ++i){ int v, w, k; cin >> v >> w >> k; item[w].pb({v, k}); } } void solve(){ for(int i = 1; i <= s; ++i) dp[i] = -1e16, sort(item[i].begin(), item[i].end(), greater<ii>()); for(int w = 1; w < W; ++w){ for(int j = s; j >= 0; --j){ int sumW = 0; long long sumVal = 0; for(auto [v, k] : item[w]){ for(int i = 1; i <= k; ++i){ sumW += w, sumVal += v; if(sumW > j) break; maximize(dp[j], dp[j - sumW] + sumVal); } if(sumW > j) break; } } } long long ans = 0; for(int i = 0; i <= s; ++i) maximize(ans, dp[i]); cout << ans; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if(fopen((NAME + ".inp").c_str(), "r")){ freopen((NAME + ".inp").c_str(), "r", stdin); freopen((NAME + ".out").c_str(), "w", stdout); } inp(); solve(); }

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'int main()':
knapsack.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen((NAME + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen((NAME + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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