0,1背包问题、这里卡了二维的情况、
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
public class Poj_3624_1 {
static StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
static PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
public static int nextInt() throws IOException {
in.nextToken();
return (int) in.nval;
}
public static String next() throws IOException {
in.nextToken();
return (String) in.sval;
}
public static void main(String[] args) throws IOException {
int N = nextInt();
int M = nextInt();
int w[] = new int[N + 1];
int d[] = new int[N + 1];
int value[] = new int[M + 1];
for(int i = 1; i <= N; i++){
w[i] = nextInt();
d[i] = nextInt();
}
for(int i = 1; i <= N; i++){
for(int k = M; k >= w[i]; k--){ // 人人为我模式 、、、
if(value[k - w[i]] + d[i] > value[k]){ // 放的价值大于不放的、、
value[k] = value[k - w[i]] + d[i];
}
}
}
out.println(value[M]);
out.flush();
}
}
二维数字存、本地测试对的、但是oj卡
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
public class Poj_3624 {
static StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
static PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
public static int nextInt() throws IOException {
in.nextToken();
return (int) in.nval;
}
public static String next() throws IOException {
in.nextToken();
return (String) in.sval;
}
public static void main(String[] args) throws IOException {
int N = nextInt();
int M = nextInt();
int[] w = new int[N + 1]; // 质量 、、
int[] d = new int[N + 1]; // 价值、、
int dp[][] = new int[N + 1][M + 1];
for (int i = 1; i <= N; i++) {
w[i] = nextInt(); //输入重量、、、
d[i] = nextInt(); // 输入价值、、、
}
for (int i = 1; i <= N; i++) { // 第 i 件 物品 进行判断、、
for(int j = 0; j <= M; j++){ // 对当前的价值 判断、、、
if(w[i] <= j){ // 放的下去、、、
if(dp[i - 1][j - w[i]] + d[i] > dp[i - 1][j]){
dp[i][j] = dp[i - 1][j - w[i]] + d[i];
}else{
dp[i][j] = dp[i - 1][j];
}
}else{
dp[i][j] = dp[i - 1][j];
}
}
}
out.println(dp[N][M]);
out.flush();
}
}