week 269

9 files changed, 429 insertions, 0 deletions

diff --git a/challenge-269/zapwai/c/ch-1.c b/challenge-269/zapwai/c/ch-1.c
new file mode 100644
index 0000000000..4bb9e78c72
--- /dev/null
+++ b/challenge-269/zapwai/c/ch-1.c
@@ -0,0 +1,80 @@
+#include <stdio.h>
+#include <math.h>
+#include <stdbool.h>
+#include "vec.h"
+
+void proc(int ints[], int N);
+bool truth(int* ints, int N);
+  
+int main() {
+  int ints[] = {1, 2, 3, 4, 5};
+  int ints2[] = {2, 3, 8, 16};
+  int ints3[] = {1, 3, 5, 7, 9};
+  proc(ints, sizeof(ints) / sizeof(int));
+  proc(ints2, sizeof(ints2) / sizeof(int));
+  proc(ints3, sizeof(ints3) / sizeof(int));
+}
+
+int* dec_to_bin(int x, int N) {
+  int* b = malloc(sizeof(int) * (N+1));
+  for (int i = 0; i <= N; i++) {
+    if (x >= pow(2, N - i)) {
+      b[i] = 1;
+      x -= pow(2, N - i);
+    } else {
+      b[i] = 0;
+    }
+  }
+  return b;
+}
+
+bool truth(int* ints, int N) {
+  for (int i = 0; i < pow(2, N); i++) {
+    int d[80] = {};
+    int* b = dec_to_bin(i, N-1);
+    /* for (int j = 0; j < N; j++) */
+    /*   printf("%d ", b[j]); */
+    /* printf("\n"); */
+    
+    vec current_list;
+    init_vec(&current_list);
+    for (int j = 0; j < N; j++)
+      if (1 == b[j])
+	push(&current_list, ints[j]);
+    free(b);
+    if (1 >= current_list.size)
+      continue;
+    int tally = 0;
+    for (int j = 0; j < current_list.size; j++)
+      tally = tally | current_list.data[j];
+
+    int* x = dec_to_bin(tally, N-1);
+    int last_bin_dig = x[N-1];
+    if (last_bin_dig == 0) {
+      display(&current_list);
+      printf(" -> ");
+      for (int j = 0; j < N; j++)
+	printf("%d", x[j]);
+      destroy_vec(&current_list);
+      free(x);
+      return 1;
+    }
+    free(x);
+    destroy_vec(&current_list);
+  }
+  return 0;
+}
+
+void proc(int ints[], int N) {
+  printf("Input: ints = { ");
+  for (int i = 0; i < N; i++)
+    printf("%d ", ints[i]);
+  printf("}\n");
+  printf("Output: ");
+  if (truth(ints, N)) {
+    printf(" true\n");
+  } else {
+    printf("false\n");
+  }
+}
+
diff --git a/challenge-269/zapwai/c/ch-2.c b/challenge-269/zapwai/c/ch-2.c
new file mode 100644
index 0000000000..c1862ff13e
--- /dev/null
+++ b/challenge-269/zapwai/c/ch-2.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include "vec.h"
+
+void proc(int ints[], int N) {
+  printf( "Input: ints = { " );
+  for (int i = 0; i < N; i++)
+    printf("%d ", ints[i]);
+  printf("}\n");
+  vec arr1; init_vec(&arr1);
+  vec arr2; init_vec(&arr2);
+  int cnt = 2;
+  push(&arr1, ints[0]);
+  push(&arr2, ints[1]);
+  
+  while (cnt < N) {
+    int x = ints[cnt];
+    cnt++;
+    if (arr1.data[arr1.size-1] > arr2.data[arr2.size-1]) {
+      push(&arr1, x);
+    } else {
+      push(&arr2, x);
+    }
+  } 
+  printf("Output: arr1 = { ");
+  for (int i = 0; i < arr1.size; i++)
+    printf("%d ", arr1.data[i]);
+
+  printf("} arr2 = { ");
+  for (int i = 0; i < arr2.size; i++)
+    printf("%d ", arr2.data[i]);
+  printf("}\n");
+  destroy_vec(&arr1);
+  destroy_vec(&arr2);
+}
+
+int main() {
+  int ints[] = {2, 1, 3, 4, 5};
+  int ints2[] = {3,2,4};
+  int ints3[] = {5, 4, 3, 8};
+  proc(ints, sizeof(ints)/sizeof(int));
+  proc(ints2, sizeof(ints2)/sizeof(int));
+  proc(ints3, sizeof(ints3)/sizeof(int));
+}
+
diff --git a/challenge-269/zapwai/c/vec.h b/challenge-269/zapwai/c/vec.h
new file mode 100644
index 0000000000..a769498c92
--- /dev/null
+++ b/challenge-269/zapwai/c/vec.h
@@ -0,0 +1,94 @@
+#ifndef VEC_H
+#define VEC_H
+#include <stdlib.h>
+typedef struct vector {
+  size_t cap;		/* actual size allocated (reduces calls to realloc)*/
+  size_t size;			/* size of data */
+  int* data;			/* integer data */
+} vec;
+
+void init_vec(struct vector* v) {
+  v->size = 0;
+  v->cap = 10;
+  v->data = malloc(v->cap * sizeof(int));
+}
+void destroy_vec(struct vector* v) {
+  free (v->data);		/* good habit */  
+}
+
+/* If a vector needs more memory, add 10 slots */
+void stretch_vec(struct vector* v) {
+  if (v->size == v->cap) {
+    v->cap += 10;
+    v->data = realloc(v->data, sizeof(int) * v->cap);
+  }
+}
+void push(struct vector* v, int value) {
+  v->size++;
+  stretch_vec(v);
+  v->data[v->size - 1] = value;
+}
+void unshift(struct vector* v, int value) {
+  v->size++;
+  stretch_vec(v);  
+  for (int i = v->size - 1; i > 0; i--) {
+    v->data[i] = v->data[i - 1];
+  }
+  v->data[0] = value;
+}
+int shift(struct vector* v) {
+  int x = v->data[0];
+  v->size--;
+  for (int i = 0; i < v->size; i++) {
+    v->data[i] = v->data[i + 1];
+  }
+  v->data[v->size] = 0;
+  return x;
+}
+int pop(struct vector* v) {
+  int x = v->data[v->size-- - 1];
+  v->data[v->size] = 0;
+  return x;
+}
+
+void push_list(struct vector* v, int* list) {
+  // ... 
+}
+
+void sort(struct vector* v) {
+  int cnt;
+  do {
+    cnt = 0;
+    for (int i = 0; i < v->size - 1; i++) {
+      if (v->data[i] > v->data[i + 1]) {
+	cnt++;
+	int tmp = v->data[i];
+	v->data[i] = v->data[i+1];
+	v->data[i+1] = tmp;
+      }
+    }
+  } while(cnt > 0);
+}
+  
+void reverse(struct vector* v) {
+  int k = v->size / 2;
+  for (int i = 0; i < k; i++) {
+    int x = v->data[k-1-i];
+    int idx = (v->size % 2 == 0) ? k+i : k+1+i;
+    v->data[k-1-i] = v->data[idx];
+    v->data[idx] = x;
+  }
+}
+
+void display(struct vector* v) {
+  printf("[");
+  if (v->size > 0){
+  for (int i = 0; i < v->size - 1; i++)
+    printf("%d, ", v->data[i]);
+  printf("%d", v->data[v->size-1]);
+  }
+  printf("]");
+}
+
+/* to do : allow list of chars, or strings. Maybe a union for data? */
+#endif
diff --git a/challenge-269/zapwai/javascript/ch-1.js b/challenge-269/zapwai/javascript/ch-1.js
new file mode 100644
index 0000000000..f60ece69cb
--- /dev/null
+++ b/challenge-269/zapwai/javascript/ch-1.js
@@ -0,0 +1,50 @@
+let ints = [1, 2, 3, 4, 5];
+let ints2 = [2, 3, 8, 16];
+let ints3 = [1, 3, 5, 7, 9];
+proc(ints);
+proc(ints2);
+proc(ints3);
+
+function truth(ints) {
+    let N = ints.length;
+    for (let i = 0; i < Math.pow(2,N) - 1; i++) {
+	let d = i.toString(2);
+	let D = d.split("");
+	while (D.length < N) {
+	    if (D.length < N) {
+		D.unshift(0);
+	    }
+	}
+	let current_list = [];
+	for (let j = 0; j < D.length; j++) {
+	    if (1 == D[j]) {
+		current_list.push(ints[j]);
+	    }
+	}
+	if (1 >= current_list.length) {
+	    continue;
+	}
+	let tally = 0;
+	for (let c of current_list) {
+	    tally = tally | c;
+	}
+	let x = tally.toString(2);
+	let last_bin_dig = x.slice(-1);
+	console.log(d, x, last_bin_dig);
+	if (last_bin_dig == "0") {		
+	    console.log(current_list,"->", x);
+	    return 1;
+	}
+    }
+    return 0;
+}
+
+function proc(ints) {
+    console.log("Input:", ints);
+    if (truth(ints)) {
+	console.log( "Output: true" );
+    } else {
+	console.log( "Output: false" );
+    }
+}
+
diff --git a/challenge-269/zapwai/javascript/ch-2.js b/challenge-269/zapwai/javascript/ch-2.js
new file mode 100644
index 0000000000..f7d71c8e34
--- /dev/null
+++ b/challenge-269/zapwai/javascript/ch-2.js
@@ -0,0 +1,21 @@
+let ints = [2, 1, 3, 4, 5];
+let ints2 = [3,2,4];
+let ints3 = [5, 4, 3, 8];
+proc(ints);
+proc(ints2);
+proc(ints3);
+
+function proc(ints) {
+    console.log( "Input: ints = ", ints );
+    let arr1 = [ints.shift()];
+    let arr2 = [ints.shift()];
+    while (ints.length > 0) {
+	let x = ints.shift();
+	if (arr1[arr1.length-1] > arr2[arr2.length-1]) {
+	    arr1.push(x);
+	} else {
+	    arr2.push(x);
+	}
+    } 
+    console.log("Output: arr1 = ", arr1, "arr2 = ", arr2);
+}
diff --git a/challenge-269/zapwai/python/ch-1.py b/challenge-269/zapwai/python/ch-1.py
new file mode 100644
index 0000000000..835d197c69
--- /dev/null
+++ b/challenge-269/zapwai/python/ch-1.py
@@ -0,0 +1,37 @@
+def truth(ints):
+    N = len(ints)
+    
+    for i in range(2**N):
+        d = format(i,'b')
+        D = list(d)
+        for i in range(N - len(d)):
+            D.insert(0, '0')
+        current_list = []
+        for j in range(len(D)):
+            if '1' == D[j]:
+                current_list.append(ints[j])
+        if 1 >= len(current_list):
+            continue
+        tally = 0
+        for c in current_list:
+            tally = tally | c
+        x = format(tally,'b')
+        last_dig = x[-1:]
+        if last_dig == '0':
+            print("\t-->",current_list, x)
+            return 1
+    return 0
+
+def proc(ints):
+    print("Input:", ints)
+    if truth(ints):
+        print( "Output: true" )
+    else:
+        print( "Output: false" )
+
+ints = [1, 2, 3, 4, 5]
+ints2 = [2, 3, 8, 16]
+ints3 = [1, 3, 5, 7, 9]
+proc(ints)
+proc(ints2)
+proc(ints3)
diff --git a/challenge-269/zapwai/python/ch-2.py b/challenge-269/zapwai/python/ch-2.py
new file mode 100644
index 0000000000..e4d7cebe5f
--- /dev/null
+++ b/challenge-269/zapwai/python/ch-2.py
@@ -0,0 +1,20 @@
+def proc(ints):
+    print("Input: ints = ", ints)
+    ints.reverse()
+    arr1 = [ints.pop()]
+    arr2 = [ints.pop()]
+    while len(ints) > 0:
+        x = ints.pop()
+        if arr1[len(arr1)-1] > arr2[len(arr2)-1]:
+            arr1.append(x)
+        else:
+            arr2.append(x)
+    print("Output: arr1 = ", arr1, "arr2 = ", arr2)
+
+ints = [2, 1, 3, 4, 5]
+ints2 = [3,2,4]
+ints3 = [5, 4, 3, 8]
+proc(ints)
+proc(ints2)
+proc(ints3)
+
diff --git a/challenge-269/zapwai/rust/ch-1.rs b/challenge-269/zapwai/rust/ch-1.rs
new file mode 100644
index 0000000000..5450f570d1
--- /dev/null
+++ b/challenge-269/zapwai/rust/ch-1.rs
@@ -0,0 +1,57 @@
+fn main() {
+    let ints = vec![1, 2, 3, 4, 5];
+    let ints2 = vec![2, 3, 8, 16];
+    let ints3 = vec![1, 3, 5, 7, 9];
+    proc(ints);
+    proc(ints2);
+    proc(ints3);
+}
+
+fn truth(ints : Vec<i32>) -> bool {
+    let N :u32 = ints.len() as u32;
+    for i in 0 .. 2_i32.pow(N) - 1 {
+	let d = format!("{:b}",i);
+	let mut D : Vec<&str> = d.split("").collect();
+	D.pop();
+	D.reverse();
+	D.pop();
+	D.reverse();
+	for _j in 0 .. N - (d.len() as u32) {
+	    D.insert(0, "0");
+	}
+	let mut current_list : Vec<i32> = Vec::new();
+	for j in 0 .. D.len() {
+	    if "1" == D[j] {
+		current_list.push(ints[j]);
+	    }
+	}
+	
+	if 1 >= current_list.len() {
+	    continue;
+	}
+	let mut tally = 0;
+	for c in &current_list {
+	    tally = tally | c;
+	}
+
+	let x = format!("{:b}", tally);
+	let last_bin_dig = x.chars().last().unwrap();
+	
+	if last_bin_dig == '0' {
+	    print!("\t{} <--> {:?} ", x, current_list);
+	    return true;
+	}
+    }
+    return false;
+}
+
+fn proc(ints : Vec<i32>) {
+    println!("Input: ints = {:?}", ints);
+    print!("Output: ");
+    if truth(ints) {
+	println!("true");
+    } else {
+	println!("false");
+    }
+}
+
diff --git a/challenge-269/zapwai/rust/ch-2.rs b/challenge-269/zapwai/rust/ch-2.rs
new file mode 100644
index 0000000000..1f25b3f4a1
--- /dev/null
+++ b/challenge-269/zapwai/rust/ch-2.rs
@@ -0,0 +1,26 @@
+fn main() {
+    let mut ints = vec![2, 1, 3, 4, 5];
+    let mut ints2 = vec![3,2,4];
+    let mut ints3 = vec![5, 4, 3, 8];
+    proc(ints);
+    proc(ints2);
+    proc(ints3);
+}
+
+fn proc(mut ints : Vec<i32>) {
+    println!("Input: ints = {:?}", ints);
+    let mut arr1 = vec![ints[0]];
+    let mut arr2 = vec![ints[1]];
+    ints.reverse();
+    ints.pop();
+    ints.pop();
+    while ints.len() > 0 {
+	let x = ints.pop().unwrap();
+	if arr1[arr1.len()-1] > arr2[arr2.len()-1] {
+	    arr1.push(x);
+	} else {
+	    arr2.push(x);
+	}
+    } 
+    println!("Output: arr1 = {:?}, arr2 = {:?}", arr1, arr2);
+}