#include <bits/stdc++.h> #define int long long using namespace std; template<typename T, typename... Args> void print(T t) {cout << t << '\n';} template<typename T, typename... Args> void print(T t, Args... args) {cout << t << " "; print(args...) ;} const int S = 2005 , MX = 1e9+7; int dp[S]; int n , s , ans = -MX; void file_input() { if (fopen("inp.txt" , "r")) { freopen("inp.txt" , "r" , stdin); freopen("out.txt" , "w" , stdout); } } void add(int v , int w) { for (int p = s-w; p >= 0; p--) { if (dp[p] == -1) {continue;} dp[p+w] = max(dp[p+w] , dp[p]+v); } } signed main() { ios_base::sync_with_stdio(false); cin.tie(NULL); file_input(); for (int i = 1; i < S; i++) {dp[i] = -1;} cin >> s >> n; while (n--) { int a , b , k; cin >> a >> b >> k; int sm = k; for (int p = 0; (k>>p) != 1; p++) { add(a<<p , b<<p); sm -= (1<<p); } add(a*sm , b*sm); } for (int p = 0; p <= s; p++) {ans = max(ans , dp[p]);} cout << ans; return 0; }

knapsack.cpp: In function 'void file_input()':
knapsack.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen("inp.txt" , "r" , stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("out.txt" , "w" , stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~