Acwing 2. 01揹包
阿新 • • 發佈:2021-08-13
題目連結 Acwing 2. 01揹包
樸素版01揹包
#include <iostream> #include <cstring> #include <algorithm> using namespace std; const int N = 1010; int n, m; int v, w; int f[N][N]; int main() { cin >> n >> m; for(int i = 1; i <= n; i ++) { cin >> v >> w; for(int j = 1; j <= m; j ++) { f[i][j] = f[i - 1][j]; //不選 if(j >= v) f[i][j] = max(f[i][j], f[i - 1][j - v] + w); //選 } } cout << f[n][m] << endl; return 0; }
優化版01揹包
#include <iostream> #include <cstring> #include <algorithm> using namespace std; const int N = 1010; int n, m; int v, w; int f[N]; int main() { cin >> n >> m; for(int i = 1; i <= n; i ++) { cin >> v >> w; for(int j = m; j >= 1; j --) { if(j >= v) f[j] = max(f[j], f[j - v] + w); //選 } } cout << f[m] << endl; return 0; }