Created
November 19, 2016 00:52
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HackerRank university codesprint - add debug info for n-p, find out n-p's meaning.
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using System; | |
using System.Collections.Generic; | |
using System.IO; | |
using System.Linq; | |
class Solution | |
{ | |
static bool[, ,] w; | |
static void Main(String[] args) | |
{ | |
//process(); | |
testing(); | |
} | |
private static void testing() | |
{ | |
n = 3; | |
s = 3; | |
k = 4; | |
w = new bool[n, s + 1, k + 1]; | |
int[] A = new int[n]; | |
IList<string> helper = new List<string>(); | |
if (construct(A, 0, 0, 0, helper) == 1) | |
Console.WriteLine(string.Join(" ", A)); | |
else | |
Console.WriteLine(-1); | |
string s2 = String.Join("\r\n", helper.ToArray()); | |
} | |
private static void process() | |
{ | |
int _tc_ = int.Parse(Console.ReadLine()); | |
while (_tc_-- > 0) | |
{ | |
Array_Construction(); | |
} | |
} | |
static int n, s, k; | |
static void Array_Construction() | |
{ | |
var tmp = Console.ReadLine().Split(' '); | |
n = int.Parse(tmp[0]); | |
s = int.Parse(tmp[1]); | |
k = int.Parse(tmp[2]); | |
w = new bool[n, s + 1, k + 1]; | |
int[] A = new int[n]; | |
IList<string> helper = new List<string>(); | |
if (construct(A, 0, 0, 0, helper) == 1) | |
Console.WriteLine(string.Join(" ", A)); | |
else | |
Console.WriteLine(-1); | |
} | |
/* | |
* Nov. 14, 2016 | |
* | |
* Julia tried to figure out this dynamic programming formula | |
* | |
* 1. change the code style to fit my reading style. | |
* | |
*/ | |
static int construct( | |
int[] A, | |
int sum, | |
int diffsum, | |
int p, | |
IList<string> trace) | |
{ | |
trace.Add(""); | |
if (p == n) | |
{ | |
if (sum == s && diffsum == k) | |
{ | |
trace.Add("sum == s && diffsum == k - find the solution! "); | |
return 1; | |
} | |
trace.Add("p==n return 0 whereas p=" + p.ToString() + " n=" + n.ToString()); | |
trace.Add(" "); | |
return 0; | |
} | |
if (w[p, sum, diffsum]) | |
{ | |
trace.Add("w[p, sum, diffsum] is true - w[" + p.ToString() + "," + sum.ToString()+ "," + diffsum.ToString() +"] - return -1"); | |
return -1; | |
} | |
else | |
{ | |
trace.Add("w[p, sum, diffsum] is not true w[" + p.ToString() + "," + sum.ToString() + "," + diffsum.ToString() + "] "); | |
w[p, sum, diffsum] = true; | |
} | |
int i = 0; | |
if (p != 0) | |
{ | |
i = A[p - 1]; | |
trace.Add("i=A[p-1], p=" + p.ToString() + ", i="+A[p-1].ToString()+";"); | |
} | |
int startDebug = i; | |
trace.Add("For loop (A - E): for(; i<=s;i++) i=" + i.ToString() + " s=" + s.ToString()); | |
trace.Add(" "); | |
for (; i <= s; i++) | |
{ | |
trace.Add("n-p=? "+(n-p).ToString()); | |
int newSum = sum + i * (n - p); | |
int newDiffSum = diffsum + (i * p - sum) * (n - p); | |
trace.Add("iterate on i =" + i.ToString()); | |
trace.Add("A: review sum, diffsum " + sum.ToString() + " " + diffsum.ToString()); | |
trace.Add("B: newSum, newDiffSum " + newSum.ToString() +" "+ newDiffSum.ToString()); | |
trace.Add("C: i, n, p i=" + i.ToString() + " n=" + n.ToString() + " p=" + p.ToString()); | |
if (newSum > s || | |
newDiffSum > k) | |
{ | |
trace.Add("D-Exception: newSum, newDiffSum are bigger than s, k " +newSum.ToString()+" "+newDiffSum.ToString() +" exit for loop."); | |
trace.Add("return 0"); | |
trace.Add(" "); | |
return 0; | |
} | |
A[p] = i; | |
trace.Add("D-set A[p]=i, A[p]="+i.ToString()+" where p="+p.ToString()+" and i="+i.ToString()); | |
// start to prepare debug text ... | |
string helper ="D-Normal: loop start to end: From "+startDebug.ToString(); | |
helper += " to " + s.ToString() + " current i = "; | |
helper += i.ToString(); | |
helper +=" and arguments:"; | |
helper += (sum + i).ToString() + " "; | |
helper += (diffsum + i * p - sum).ToString(); | |
helper += " " + (p + 1).ToString(); | |
trace.Add(helper); | |
helper = "E: Array A is [" + string.Join(",", A)+"]"; | |
trace.Add(helper); | |
// the end | |
trace.Add("F: recursive call construct - arguments: (A,"+(sum+i).ToString()+"," | |
+ (diffsum + i * p - sum).ToString()+","+(p+1).ToString()+")"); | |
var z = construct(A, sum + i, diffsum + i * p - sum, p + 1, trace); | |
//if (z == -1) return 0; | |
if (z == 1) return 1; | |
} | |
return 0; | |
} | |
} |
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