Submission #688409

#	Time	Username	Problem	Language	Result	Execution time	Memory
688409		koolaider	Knapsack (NOI18_knapsack)	C++17	37 / 100	1087 ms	25120 KiB

knapsack

#include <bits/stdc++.h>
#include <cstdlib>
using namespace std;
 
void setIO(string s) {
	freopen((s + ".in").c_str(), "r", stdin);
	freopen((s + ".out").c_str(), "w", stdout);
}
 
 
#define watch(x) cerr << "\n" << (#x) << " is " << (x) << endl
#define pb push_back
#define ll long long
 
const int MN = 1e5+2;
 
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
 
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

/*
  a b y x b
a 1 1 1 1 1
x 1 1 1 2 2
y 1 1 2 2 2
b 1 2 2 2 3
 */
 
//#pragma GCC target ("avx,avx2")
//#pragma GCC optimize ("Ofast")
//DSUFlowHyRuthTh!
 
 
//const long long ML = 1e18;
//const int MN = 1e9;
 
const int MM = 1e9+7;


int main(int argc, char **argv){
	//ios_base::sync_with_stdio(false); cin.tie(NULL), cout.tie(NULL);	
	//setIO("time");
	int s, n; cin >> s >> n;
	int v, w, k; 
	vector<int> values; vector<int> weights;
	for(int i = 0; i<n; i++){
		cin >> v >> w >> k;
		for(int j = 0; j<k; j++){
			values.pb(v); weights.pb(w);
			}
	}
	int amount = values.size();
	ll dp[2+1][s+1]; memset(dp, 0, sizeof(dp));
	bool f = true;
	for(int y = 1; y<=amount; y++){
		for(int x = 1; x<=s; x++){
		if(f==true){
		if(x-weights[y-1]>=0) dp[1][x]=dp[1-1][x-weights[y-1]]+values[y-1];
		dp[1][x]=max(dp[1][x], dp[1-1][x]);
		}else{
		if(x-weights[y-1]>=0) dp[2][x]=dp[2-1][x-weights[y-1]]+values[y-1];
		dp[2][x]=max(dp[2][x], dp[2-1][x]);	
		}
		}
	for(int x = 1; x<=s; x++){
		if(f==true){
		dp[2][x]=dp[1][x];
		}else{
		dp[0][x]=dp[2][x];
		}
		}
	f=!f;
	}
	cout << dp[2][s];
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:6:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 |  freopen((s + ".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:7:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |  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