Task: Subset sum problem



C#: using System;
using System.Collections.Generic;

namespace SubsetSum {
    class Item {
        public Item(string word, int weight) {
            Word = word;
            Weight = weight;
        }

        public string Word { get; set; }
        public int Weight { get; set; }

        public override string ToString() {
            return string.Format("({0}, {1})", Word, Weight);
        }
    }

    class Program {
        private static readonly List<Item> items = new List<Item>() {
            new Item("alliance", -624),
            new Item("archbishop", -915),
            new Item("balm", 397),
            new Item("bonnet", 452),
            new Item("brute", 870),
            new Item("centipede", -658),
            new Item("cobol", 362),
            new Item("covariate", 590),
            new Item("departure", 952),
            new Item("deploy", 44),
            new Item("diophantine", 645),
            new Item("efferent", 54),
            new Item("elysee", -326),
            new Item("eradicate", 376),
            new Item("escritoire", 856),
            new Item("exorcism", -983),
            new Item("fiat", 170),
            new Item("filmy", -874),
            new Item("flatworm", 503),
            new Item("gestapo", 915),
            new Item("infra", -847),
            new Item("isis", -982),
            new Item("lindholm", 999),
            new Item("markham", 475),
            new Item("mincemeat", -880),
            new Item("moresby", 756),
            new Item("mycenae", 183),
            new Item("plugging", -266),
            new Item("smokescreen", 423),
            new Item("speakeasy", -745),
            new Item("vein", 813),
        };

        private static readonly int n = items.Count;
        private static readonly int LIMIT = 5;

        private static int[] indices = new int[n];
        private static int count = 0;

        private static void ZeroSum(int i, int w) {
            if (i != 0 && w == 0) {
                for (int j = 0; j < i; j++) {
                    Console.Write("{0} ", items[indices[j]]);
                }
                Console.WriteLine("\n");
                if (count < LIMIT) count++;
                else return;
            }
            int k = (i != 0) ? indices[i - 1] + 1 : 0;
            for (int j = k; j < n; j++) {
                indices[i] = j;
                ZeroSum(i + 1, w + items[j].Weight);
                if (count == LIMIT) return;
            }
        }

        static void Main(string[] args) {
            Console.WriteLine("The weights of the following {0} subsets add up to zero:\n", LIMIT);
            ZeroSum(0, 0);
        }
    }
}


Go: package main

import "fmt"

type ww struct {
    word   string
    weight int
}

var input = []*ww{
    {"alliance", -624},
    {"archbishop", -915},
    {"balm", 397},
    {"bonnet", 452},
    {"brute", 870},
    {"centipede", -658},
    {"cobol", 362},
    {"covariate", 590},
    {"departure", 952},
    {"deploy", 44},
    {"diophantine", 645},
    {"efferent", 54},
    {"elysee", -326},
    {"eradicate", 376},
    {"escritoire", 856},
    {"exorcism", -983},
    {"fiat", 170},
    {"filmy", -874},
    {"flatworm", 503},
    {"gestapo", 915},
    {"infra", -847},
    {"isis", -982},
    {"lindholm", 999},
    {"markham", 475},
    {"mincemeat", -880},
    {"moresby", 756},
    {"mycenae", 183},
    {"plugging", -266},
    {"smokescreen", 423},
    {"speakeasy", -745},
    {"vein", 813},
}

type sss struct {
    subset []*ww
    sum    int
}

func main() {
    ps := []sss{{nil, 0}}
    for _, i := range input {
        pl := len(ps)
        for j := 0; j < pl; j++ {
            subset := append([]*ww{i}, ps[j].subset...)
            sum := i.weight + ps[j].sum
            if sum == 0 {
                fmt.Println("this subset sums to 0:")
                for _, i := range subset {
                    fmt.Println(*i)
                }
                return
            }
            ps = append(ps, sss{subset, sum})
        }
    }
    fmt.Println("no subset sums to 0")
}