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#1 IngeniousHax ?
Reputation: 75
- Posts: 1,329
- Joined: 28-March 09
Posted Yesterday, 06:17 PM
Alright, so I got the coin change problem working just fine, but I can't seem to keep track of the used coins. I get incorrect values since I went about it in a recursive manner, so when values are stored in the array, it's not the correct index.I get the following output from the entire program:
Minimum number of coins needed to make change for $12.00: 2
--[ The table for the minimum number of coins at each denomination ]--
0 0
1 1
2 2
3 3
4 4
5 5
6 1
7 2
8 3
9 4
10 1
11 2
12 2
0 : {0, 0, 0, 0, 0}
1 : {1, 0, 0, 0, 0}
2 : {10, 1, 6, 6, 1}
3 : {1, 1, 1, 1, 10}
4 : {6, 1, 10, 6, 1}
5 : {6, 1, 6, 1, 6}
6 : {1, 0, 0, 0, 0}
7 : {0, 0, 0, 0, 0}
8 : {0, 0, 0, 0, 0}
9 : {0, 0, 0, 0, 0}
10 : {0, 0, 0, 0, 0}
11 : {0, 0, 0, 0, 0}
12 : {0, 0, 0, 0, 0}
And here is my code:
#include <iostream> #include <iomanip> #include <string> using namespace std; #define INF 10000 // A large value that denotes infinity /* Globals, Shouldn't be used, but makes my life easier for the mean time */ int denominations[3]; int change(int); void vals(); int c[13][5] = {{0}, {0}}; int v[13] = {0}; int j = 2, k = 0; int main(int argc, char* argv[]) { int coin = 12; int i = 0; denominations[0] = 1; denominations[1] = 6; denominations[2] = 10; for(i = 0; i < 13; i++) v[i] = INF; v[0] = 0; c[1][0] = v[1] = 1; cout << "Minimum number of coins needed to make change for $12.00: " << change(coin) << endl; cout << "--[ The table for the minimum number of coins at each denomination ]--" << endl; for(i = 0; i < 13; i++) cout << i << "\t" << v[i] << endl; vals(); cin.get(); }
int change(int init_val) { int test = INF, min = INF, remaining = 0, i = 0; if(init_val > 1) { for(i = 2; i >= 0; i--) { if(init_val >= denominations[i]) { remaining = init_val - denominations[i]; c[j][k] = denominations[i]; k++; if(v[remaining] != INF) { test = 1 + v[remaining]; } else if(v[remaining] == INF) { test = 1 + change(remaining); } if(test <= min) { min = test; } } } v[init_val] = min; return v[init_val]; } if(init_val == 1) { min = v[1]; test = 1; j++; return v[1]; } if(init_val == 0) { min = v[0]; test = 0; k = 0; j++; return v[0]; } }
Any help or pushes in the correct direction would be greatly appreciated.
This post has been edited by IngeniousHax: Yesterday, 06:23 PM
Is This A Good Question/Topic? 0
Replies To: Modify coin change to keep track of used coins?
#2 andrewsw ?
Reputation: 762
- Posts: 2,380
- Joined: 12-December 12
Re: Modify coin change to keep track of used coins?
Posted Yesterday, 06:31 PM
What "coin change problem" ??
#3 IngeniousHax ?
Reputation: 75
- Posts: 1,329
- Joined: 28-March 09
Re: Modify coin change to keep track of used coins?
Posted Yesterday, 06:41 PM
It's a dynamic programming approach to making change for some value using the least amount of denominations possible, given that you have an infinite supply of each denomination.This post has been edited by IngeniousHax: Yesterday, 06:41 PM
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Source: http://www.dreamincode.net/forums/topic/317837-modify-coin-change-to-keep-track-of-used-coins/
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