Submission #1145346

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145346		blueviolet	Knapsack (NOI18_knapsack)	C++20	73 / 100	1096 ms	328 KiB

knapsack

#include             <bits/stdc++.h>
    
#define             ll   long long
#define            pll   pair<ll, ll>
#define            pii   pair<int, int>
#define          io(x)   if (fopen(x".inp","r")) {freopen(x".inp","r",stdin),freopen(x".out","w",stdout);}
#define      mem(c, x)   memset(c, x, sizeof(c))
#define         all(c)   c.begin(), c.end()
#define       bit(i,j)   ((i >> j) & 1)
#define             pb   push_back
#define             se   second     
#define             fi   first
#define             el   '\n'
using namespace std;  

template<class T> bool   maximize(T &a, const T &b) { return (a < b ? a = b, 1 : 0); }
template<class T> bool   minimize(T &a, const T &b) { return (a > b ? a = b, 1 : 0); }

int dx[8] = {0, 1, 0,-1, 1, 1,-1,-1};
int dy[8] = {1, 0,-1, 0, 1,-1,-1, 1};
const int  maxn  = 2e3 + 1;
const int  Inf   = 2e9 + 7;
const ll   Infll = 1e18 + 9;
const ll   Mod   = 1e9 + 7;
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
ll dp[maxn];    
int n, s;

void solve() {
    cin >> s >> n;
    for (int i=1; i<=n; i++) {
        int v, w, sl; cin >> v >> w >> sl;
        ll sum = 0;
        for (int i=0; sum + (1 << i) <= sl; i++) {
            ll W = 1ll * w * (1ll << i), V = 1ll * v * (1ll << i);
            for (int j=s; j>=W; j--) {
                maximize(dp[j], dp[j-W] + V);
            }
            sum += (1 << i);
        }
        if (sum < sl) {
            ll W = 1ll * w * (sl - sum), V = 1ll * v * (sl - sum);
            for (int j=s; j>=W; j--) {
                maximize(dp[j], dp[j-W] + V);
            }
        }        
    }

   
    cout << dp[s];

}

signed main() {
    
    ios_base::sync_with_stdio(false);  cin.tie(0); cout.tie(0); 
    io("task"); 

    solve();
    
    return (0 ^ 0);
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:6:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define          io(x)   if (fopen(x".inp","r")) {freopen(x".inp","r",stdin),freopen(x".out","w",stdout);}
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~
knapsack.cpp:57:5: note: in expansion of macro 'io'
   57 |     io("task");
      |     ^~
knapsack.cpp:6:85: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define          io(x)   if (fopen(x".inp","r")) {freopen(x".inp","r",stdin),freopen(x".out","w",stdout);}
      |                                                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~
knapsack.cpp:57:5: note: in expansion of macro 'io'
   57 |     io("task");
      |     ^~

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