Submission #209524

#	Time	Username	Problem	Language	Result	Execution time	Memory
209524		model_code	Knapsack (NOI18_knapsack)	C++14	73 / 100	1101 ms	31608 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int N, S, M;
ll W[2000000], V[2000000], dp[2005];
int main() {
  scanf("%d%d", &S, &N);
    M = 0;
    ll ans = 0;
    for (int i = 0; i < N; ++i) {
      ll v, w, cnt;
      scanf("%lld%lld%lld", &v, &w, &cnt);
      cnt = min(cnt, S/w);
      for (int k = 0; cnt > 0; ++k) {
        if ((1<<k) >= cnt) {
          V[M] = v*cnt;
          W[M] = w*cnt;
          if (W[M] <= S) ++M;
          ++M;
          cnt = 0;
        } else {
          V[M] = v*(1<<k);
          W[M] = w*(1<<k);
          if (W[M] <= S) ++M;
          else break;
          ++M;
          cnt -= (1<<k);
        }
      }
    }
    memset(dp, 0, sizeof dp);
    for (int x = 0; x < M; ++x) {
      for (ll s = S; s >= W[x]; --s) {
        dp[s] = max(dp[s], dp[s-W[x]]+V[x]);
      }
    }
    printf("%lld\n", *max_element(dp, dp+S+1)+ans);
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:7:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &S, &N);
   ~~~~~^~~~~~~~~~~~~~~~
knapsack.cpp:12:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%lld%lld%lld", &v, &w, &cnt);
       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 24 / 24
• Subtask 5: 0 / 27