Submission #515882

#	Time	Username	Problem	Language	Result	Execution time	Memory
515882		hades42	Knapsack (NOI18_knapsack)	C++14	37 / 100	1100 ms	66092 KiB

knapsack

#include <bits/stdc++.h>
#define ll long long

using namespace std;

typedef tuple<ll, ll, ll> tp;
typedef pair<ll, ll> pr;

const ll MOD = 1000000007;
const ll INF = 1e18;

template <typename T> void print(const T &t) {
  std::copy(t.cbegin(), t.cend(),
            std::ostream_iterator<typename T::value_type>(std::cout, " "));
  cout << endl;
}

template <typename T> void print2d(const T &t) {
  std::for_each(t.cbegin(), t.cend(), print<typename T::value_type>);
}

void setIO(string s) { // the argument is the filename without the extension
  freopen((s + ".in").c_str(), "r", stdin);
  freopen((s + ".out").c_str(), "w", stdout);
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);
    ll s, n; cin >> s >> n;
    vector<pr> things;
    for(ll i = 0; i < n; i++){
        ll v, w, k; cin >> v >> w >> k;
        while(k--){
            things.push_back({v, w});
        }
    }
    //for(auto el : things){
        //cout << el.first << " " << el.second << endl;
    //}
    vector<ll> dp(s+1);
    for(ll i = 0; i < things.size(); i++){
        for(ll val = s; val >= 1; val--){
            if(val - things[i].second >= 0){
                dp[val] = max(dp[val], dp[val - things[i].second] + things[i].first);
            }
        }
    }
    cout << dp[s] << endl;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:42:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(ll i = 0; i < things.size(); i++){
      |                   ~~^~~~~~~~~~~~~~~
knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:23:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:24:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   freopen((s + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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