Submission #1081019

#TimeUsernameProblemLanguageResultExecution timeMemory
1081019O_ElmasryKnapsack (NOI18_knapsack)C++17
100 / 100
37 ms20572 KiB
#include <bits/stdc++.h> #pragma GCC optimize("O3,unroll-loops") using namespace std; #ifdef LOCAL #include "debug.h" #else #define dbg(...) #define Timer int #endif #define endl '\n' const long long mod = 1e9 + 7, Mxn = 500'005, INF = 1e18; void solve() { long long n, s; cin >> s >> n; vector<array<int, 3>>v(n + 1); vector<vector<array<int, 2>>>by_weight(s + 1); for(int i = 1;i <= n;i++){ cin >> v[i][0] >> v[i][1] >> v[i][2]; by_weight[v[i][1]].push_back({v[i][0], v[i][2]}); } for(auto &i : by_weight)sort(i.begin(), i.end(), [](array<int, 2>a, array<int, 2>b){ if(a[0] != b[0])return a[0] < b[0]; return a[1] < b[1]; }); vector<vector<int>>dp(s + 1, vector<int>(s + 1, -100)); dp[0][0] = 0; for(int i = 1;i <= s;i++){ int sum = 0, vals = 0, cost = 0; dp[i] = dp[i - 1]; for(;cost <= s && !by_weight[i].empty();){ sum += by_weight[i].back()[0]; cost += i; by_weight[i].back()[1]--; if(by_weight[i].back()[1] == 0)by_weight[i].pop_back(); for(int j = cost;j <= s;j++){ dp[i][j] = max(dp[i][j], dp[i - 1][j - cost] + sum); } } } int ans = *max_element(dp[s].begin(), dp[s].end()); cout << ans << endl; } signed main() { Timer timer; ios::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr); #ifdef LOCAL FileRedirect("test"); #endif int tc = 1; // cin >> tc; for (int i = 1; i <= tc; i++) { solve(); } }

Compilation message (stderr)

knapsack.cpp: In function 'void solve()':
knapsack.cpp:29:18: warning: unused variable 'vals' [-Wunused-variable]
   29 |     int sum = 0, vals = 0, cost = 0;
      |                  ^~~~
knapsack.cpp: In function 'int main()':
knapsack.cpp:46:9: warning: unused variable 'timer' [-Wunused-variable]
   46 |   Timer timer;
      |         ^~~~~
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