Go: package main

import (
	"bufio"
	"os"
	"strconv"
	"strings"
	"fmt"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	Case := 1
	for {
		scanner.Scan()
		W, _ := strconv.Atoi(scanner.Text())
		if W == 0 {
			break
		}
		scanner.Scan()
		n, _ := strconv.Atoi(scanner.Text())
		w := make([]int, n+1)
		v := make([]int, n+1)
		for i := 1; i <= n; i++ {
			scanner.Scan()
			info := strings.Split(scanner.Text(), ",")
			v[i], _ = strconv.Atoi(info[0])
			w[i], _ = strconv.Atoi(info[1])
		}
		// fmt.Println(v)
		// fmt.Println(w)
		dp := make([][]int, n+1)
		for i := range dp {
			dp[i] = make([]int, W+1)
		}
		maxV := -(1 << 21)
		minW := 1 << 21
		for i := 1; i <= n; i++ {
			for j := 1; j <= W; j++ {
				// fmt.Println(dp)
				if j-w[i] >= 0 {
					dp[i][j] = max(dp[i-1][j], dp[i-1][j-w[i]]+v[i])
					if maxV < dp[i][j] {
						maxV = dp[i][j]
						minW = j
					} else if maxV == dp[i][j] {
						minW = min(minW, j)
					}
				} else {
					dp[i][j] = dp[i-1][j]
				}
			}
		}
		fmt.Printf("Case %d:\n", Case)
		Case += 1
		fmt.Println(maxV)
		fmt.Println(minW)
	}
}
func max(x, y int) int {
	if x < y {
		return y
	}
	return x
}
func min(x, y int) int {
	if x < y {
		return x
	}
	return y
}

C++: #include <iostream>
#include <algorithm>
#include <stdio.h>

using namespace std;

#define WMAX 1000
#define NMAX 1000
int main(void)
{
    int W, n;
    int cyc = 0;
    while (cin >> W && W && cin >> n) {
        cyc++;
        int dp[WMAX+1][NMAX+1] = {};
        for (int i = 0; i < n; i++) {
            int v, w;
            scanf("%d,%d", &v, &w);
            for (int j = 0; j < W+1; j++)
                dp[j][i+1] = max(dp[j][i], (j-w >= 0 ? dp[j-w][i] + v : 0));
        }
        cout << "Case " << cyc << ":" << endl;
        for (int j = 0; j < W+1; j++) {
            if (dp[j][n] == dp[W][n]) {
                cout << dp[j][n] << endl << j << endl;
                break;
            }
        }
    }
}

C++: #include <bits/stdc++.h>
using namespace std;

struct Item{
	int v,w;
	int idx;	
};
const int INF = 1000000000;
class Knapsack{
public:
	
	
	int maximumWeight;
	vector<Item> items;
	Knapsack(int maximumWeight_,vector<Item> items_) : maximumWeight(maximumWeight_),items(items_) {
		used.resize(items.size(),false);
		totalWeight = totalValue = 0;
		sort(items.begin(),items.end(),[](Item a,Item b){ return a.v * b.w > b.v * a.w; });
	}
	int totalValue;
	int totalWeight;
	vector<bool> used;
	bool operator < (const Knapsack &op) const {
		if( totalValue == op.totalValue )
			return totalWeight > op.totalWeight;
		return totalValue < op.totalValue;
	}

	bool canPut(const Item &x){
		return !used[x.idx] && x.w <= maximumWeight - totalWeight;
	}
	bool putItem(const Item &x){
		if( canPut(x) ){
			totalWeight += x.w;
			totalValue += x.v;
			used[x.idx] = true;
			return true; // success
		}else{
			return false; // failure
		}
	}
	bool removeItem(const Item &x){
		if( used[x.idx] ){
			totalWeight -= x.w;
			totalValue -= x.v;
			used[x.idx] = false;
			return true;
		}
		return false;
	}
	int swapAtoB(Item x,Item y){
		if( used[x.idx] && !used[y.idx] ){
			if( totalWeight - x.w + y.w > maximumWeight ) return -INF;
			return y.v - x.v;
		}else{
			return -INF;
		}
	}
	Knapsack knapSackDP(int scale) const{
		Knapsack res = *this;
		int maximumValue = -INF;
		for( auto i : res.items ){
			maximumValue = max(maximumValue,i.v);
		}

		double rate = min(1.0,1.*scale/maximumValue);
		for( auto &i : res.items ){
			i.v = (int)(ceil(rate*i.v)+1e-9);
		}
		
		vector<int> dp(scale+1,INF),lastId(scale+1,-1);
		dp[0] = 0;
		for(int i = 0 ; i < res.items.size() ; i++){
			if( res.used[i] ) continue;
			for(int j = scale ; j >= res.items[i].v ; j--){
				if( dp[j-res.items[i].v] + res.items[i].w < dp[j] ){
					dp[j] = dp[j-res.items[i].v] + res.items[i].w;
					lastId[j] = i;
				}
			}
		}
		for(int i = scale ; i >= 0 ; i--){
			if( dp[i] <= maximumWeight - totalWeight ){
				int cur = i;
				while(cur > 0){
					int p = lastId[cur];
					res.putItem(res.items[p]);
					cur -= res.items[p].v;
					if( p == -1 ) exit(0);
				}
				break;
			}
		}
		return res;
	}
	Knapsack localImprovement() const{
		Knapsack res = *this;
		while(true){
			// ????¬??????????????????????????????§??????????
			for(int i = 0 ; i < res.items.size() ; i++){	
				res.putItem(res.items[i]);
			}
			auto reflesh = [&](){
				for(int i = 0 ; i < res.items.size() ; i++){
					if( res.used[i] ){

						auto tmp = res;
						tmp.removeItem(tmp.items[i]);
						for(int j = 0 ; j < tmp.items.size() ; j++){
							if( i != j && !tmp.used[j] ){	
								tmp.putItem(tmp.items[j]);
							}
						}
						if( res < tmp ){
							res = tmp;
							return true;
						}
					}
				}
				return false;
			};
			if( reflesh() ) continue;
			
			auto reflesh2 = [&](){
				for(int i = 0 ; i < res.items.size() ; i++){
					if( res.used[i] ){

						for(int j = 0 ; j < res.items.size() ; j++){
							if( !res.used[j] ){
								if( res.swapAtoB(res.items[i],res.items[j]) >= 0 ){
									res.removeItem(res.items[i]);
									res.putItem(res.items[j]);
									return true;
								}
							}
						}
					}
				}
				return false;
			};
			if( reflesh2() ) continue;
			break;
		}
		return res;
	}
};




int main(){
	int n,m;
	int t=1;
	while(cin >> n >> m && n){
		vector<Item> items;
		for(int i = 0 ; i < m ; i++){
			int x,y;
			scanf("%d,%d",&x,&y);
			items.push_back({x,y,i});
		}
		Knapsack knap(n,items);
		knap = knap.knapSackDP(11000).localImprovement();
		cout << "Case " << t++ << ":" << endl;
		//knap = knap.localImprovement();
		cout << knap.totalValue << "\n" << knap.totalWeight << endl;
	}
}

C++: #include<iostream>
#include<cstdio>
#include<queue>
using namespace std;

int main(){
	int w, n, ca = 0;
	while(cin >>w){
		if(w == 0) break;
		ca++;
		int prev[1000], prew[1000], ans = 0, ansc = 0, anscnt = 0;
		cin >>n;
		for(int i = 0; i < n; i++){
			scanf("%d,%d", &prev[i], &prew[i]);
		}
		int s = 0, lim = 0;
		while(s < n){
			queue<int> v;
			int cnt = 0;
			for(int j = s; j <= lim; j++){
				v.push(j);
				cnt += prew[j];
			}
			if(lim >= n - 1){
				s++;
				lim = s;
			} else{
				lim++;
			}
			if(cnt > w) continue;
			int sum = 0, c = 0;
			while(!v.empty()){
				int a = v.front();
				sum += prev[a];
				v.pop();
				c++;
			}
			if(ans < sum || (ans == sum && c > ansc)){
				ans = sum;
				anscnt = cnt;
			}
		}
		cout <<"Case " <<ca <<":" <<endl <<ans <<endl <<anscnt <<endl;
	}
	return 0;
}

C++: #include<cstdio>
#include<iostream>
#include<algorithm>
#define int long long
using namespace std;
int dp[1001],N,v[1001],w[1001],W;
signed main(){
    for(int num=1;;num++){
        cin>>W;
        if(W==0)break;
        cin>>N;
        for(int i=0;i<N;i++){
            scanf("%lld,%lld",&v[i],&w[i]);
        }
        fill(dp,dp+1001,0);
        for(int i=0;i<N;i++){
            for(int j=W;j>=w[i];j--){
                dp[j]=max(dp[j],dp[j-w[i]]+v[i]);
            }
        }
        for(int i=W;i>=0;i--){
            if(dp[W]!=dp[i]){
                cout<<"Case "<<num<<":"<<endl<<dp[W]<<endl<<i+1<<endl;
                break;
            }
        }
    }
    return 0;
}