Submission #1086673

#TimeUsernameProblemLanguageResultExecution timeMemory
1086673lemon4lifeKnapsack (NOI18_knapsack)C++17
100 / 100
56 ms36432 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair <ll, ll> pii; #define fi first #define se second bool TURN(bool &X){ if (X) return 0; X = 1; return 1;} template <class X, class Y> bool mini(X &x, const Y &y){ if (x > y){ x = y; return true;} return false;} template <class X, class Y> bool maxi(X &x, const Y &y){ if (x < y){ x = y; return true;} return false;} const int S = 2e3 + 5; ll dp[S][S]; vector <pii> g[S]; void solve(){ int s, n; cin >> s >> n; for (ll i = 1, v, w, k; i <= n; ++i){ cin >> v >> w >> k; g[w].push_back({-v, k}); } memset(dp, -0x3f, sizeof dp); dp[0][0] = 0; ll ans = 0; for (int i = 1; i <= s; ++i){ sort(g[i].begin(), g[i].end()); for (int j = s; j >= 0; --j){ dp[i][j] = dp[i - 1][j]; if (g[i].size() == 0) continue; ll y = 0, cur = g[i][0].second, sum = 0; for (int x = 1; j - x * i >= 0; ++x){ sum -= g[i][y].first; maxi(dp[i][j], dp[i - 1][j - x * i] + sum); cur--; if (cur == 0){ if (y == g[i].size() - 1) break; y++; cur = g[i][y].second; } } maxi(ans, dp[i][j]); } } cout << ans; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen("BALO.INP", "r")){ freopen("BALO.INP", "r", stdin); freopen("BALO.OUT", "w", stdout); } solve(); return 0; }

Compilation message (stderr)

knapsack.cpp: In function 'void solve()':
knapsack.cpp:53:27: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |                     if (y == g[i].size() - 1) break;
      |                         ~~^~~~~~~~~~~~~~~~~~
knapsack.cpp: In function 'int main()':
knapsack.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen("BALO.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen("BALO.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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