a.cpp

#include<iostream>

using namespace std;

int main(int argc, char *argv[]){
    FILE *file;

    int things[500][2], weight = 0, numbers = 0;
    int cur[20001], res[20001];

    cout<<"Hello, World"<<endl;
    file = fopen(argv[1], "r");
    fscanf(file, "%d", &weight);
    fscanf(file, "%d", &numbers);

    for (int i = 0; i < weight; i++){
        fscanf(file, "%d", &things[i][0]);
        fscanf(file, "%d", &things[i][1]);
    }

    for (int i = 0; i <= weight; i++){
       cur[i] = 0;
    }

    for (int i = 1; i <= numbers; i++){
        for (int j = 0; j <= weight; j++){
            res[j] = cur[j];
        }

        for (int j = things[i][1]; j <= weight; j++) {
            int val = res[j-things[i][1]] + things[i][0];
            if (res[j] < val) {
                cur[j] = val;
            }
        }
    }

    cout << cur[weight] << endl;

    return 0;
}

b.cpp

#include<iostream>
 
using namespace std;
 
int main(int argc, char *argv[]){
    FILE *file;
 
    int things[500][2], weight = 0, numbers = 0;
	int* cur = new int[2000001]; 
	int* res = new int[2000001];
 
    cout<<"Hello, World"<<endl;

    file = fopen(argv[1], "r");
    fscanf(file, "%d", &weight);
    fscanf(file, "%d", &numbers);
 
    for (int i = 0; i < weight; i++){
        fscanf(file, "%d", &things[i][0]);
        fscanf(file, "%d", &things[i][1]);
    }
 
    for (int i = 0; i <= weight; i++){
       cur[i] = 0;
    }
 
    for (int i = 1; i <= numbers; i++){
        for (int j = 0; j <= weight; j++){
            res[j] = cur[j];
        }
 
        for (int j = things[i-1][1]; j <= weight; j++) {
            int val = res[j-things[i-1][1]] + things[i-1][0];
            if (res[j] < val) {
                cur[j] = val;
            }
        }
    }
 
    cout << cur[weight] << endl;
 
    system("pause");
}

c.cpp

#include<iostream>
 
using namespace std;
 
int main(int argc, char *argv[]){
    FILE *file;
 
    int things[500][2], weight = 0, numbers = 0;
	int* cur = new int[2000001]; 
	int* res = new int[2000001];

    file = fopen(argv[1], "r");
    fscanf(file, "%d", &weight);
    fscanf(file, "%d", &numbers);
 
    for (int i = 0; i < numbers; i++){
        fscanf(file, "%d", &things[i][0]);
        fscanf(file, "%d", &things[i][1]);
    }
 
    for (int i = 0; i <= weight; i++){
       cur[i] = 0;
    }
 
    for (int i = 0; i < numbers; i++){
        for (int j = 0; j <= weight; j++){
            res[j] = cur[j];
        }
 
        for (int j = things[i][1]; j <= weight; j++) {
            int val = res[j-things[i][1]] + things[i][0];
            if (res[j] < val) {
                cur[j] = val;
            }
        }
    }
 
    cout << cur[weight] << endl;
 
    system("pause");
}