chore: use iwyu on others/**.cpp

Author: realstealthninja

others/decimal_to_roman_numeral.cpp

@@ -4,10 +4,8 @@
  * to both Lower case and Upper case Roman Numeral
  */
 
-#include <cmath>
-#include <cstdio>
-#include <cstring>
-#include <iostream>
+#include <iostream>  // for char_traits, basic_ostream, operator<<, basic_os...
+#include <string>    // for basic_string, operator+, allocator, string, oper...
 
 /** This functions fills a string with character c, n times and returns it
  * @note This can probably be replace by `memcpy` function.

others/easter.cpp

@@ -17,9 +17,8 @@
  * @author [AlternateWalls](https://github.com/AlternateWalls)
  */
 
-#include <cassert>   /// for assert
-#include <cstdint>   /// for integral typedefs
-#include <iostream>  /// for IO operations
+#include <cassert>  // for assert
+#include <cstdint>  // for uint64_t
 
 /*
  * @brief Contains information for Easter date

others/fast_integer_input.cpp

@@ -3,7 +3,8 @@
  * @brief Read integers from stdin continuously as they are entered without
  * waiting for the `\n` character
  */
-#include <iostream>
+#include <iostream>  // for char_traits, basic_ostream, basic_ostream::opera...
+#include <cstdio>    // for getchar
 
 /** Function to read the number from stdin. The function reads input until a non
  * numeric character is entered.

others/iterative_tree_traversals.cpp

@@ -35,11 +35,12 @@
  * set of steps until the Stack becomes empty or the current becomes NULL. And
  * return the result array as the inorder traversal of a tree.
  */
-#include <algorithm>  /// for `reverse`
-#include <cassert>    /// for `assert`
-#include <iostream>   /// for I/O operations
-#include <stack>      /// for `stack`
-#include <vector>     /// for `vector`
+#include <stdint.h>   // for int64_t
+#include <algorithm>  // for reverse
+#include <cassert>    // for assert
+#include <iostream>   // for basic_ostream, operator<<, char_traits, cout, endl
+#include <stack>      // for stack
+#include <vector>     // for vector
 
 /**
  * @namespace others

others/kadanes3.cpp

@@ -14,11 +14,13 @@
  * @author [Abhijeet Tiwari](https://github.com/thisabhijeet)
  */
 
-#include <array>     /// for std::array
-#include <cassert>   /// for assert
-#include <climits>   /// for INT_MIN value
-#include <cstdint>   /// for integral typedefs
-#include <iostream>  /// for IO operations
+#include <array>     // for array
+#include <cassert>   // for assert
+#include <climits>   // for INT_MIN
+#include <cstdint>   // for int64_t, uint64_t
+#include <iostream>  // for operator<<, basic_ostream, cout
+#include <cstddef>   // for size_t
+
 /**
  * @brief Utility function to check the current maximum number
  * \param arr input array

others/kelvin_to_celsius.cpp

@@ -17,9 +17,10 @@
  * @author [David Leal](https://github.com/Panquesito7)
  */
 
-#include <cassert>   /// for assert
-#include <cmath>     /// for std::abs
-#include <iostream>  /// for IO operations
+#include <bits/std_abs.h>  // for abs
+#include <cassert>         // for assert
+#include <iostream>        // for operator<<, basic_ostream, cout
+#include <stdexcept>       // for invalid_argument
 
 /**
  * @namespace

others/matrix_exponentiation.cpp

@@ -22,8 +22,9 @@ Steps for Matrix Expo
 The first element of this matrix is the required result.
 */
 
-#include <iostream>
-#include <vector>
+#include <stdint.h>  // for int64_t
+#include <iostream>  // for basic_istream, char_traits, cin, basic_ostream
+#include <vector>    // for vector
 
 using std::cin;
 using std::cout;

others/palindrome_of_number.cpp

@@ -5,14 +5,14 @@
  *
  * This program cheats by using the STL library's std::reverse function.
  */
-#include <algorithm>
-#include <iostream>
+#include <algorithm>  // for reverse
+#include <iostream>   // for operator<<, basic_ostream, cout, basic_istream:...
+#include <string>     // for basic_string, allocator, operator==, string
 
 #ifdef _MSC_VER
 // Required to compile std::toString function using MSVC
-#include <string>
+#include <string>     // for basic_string, allocator, operator==, string
 #else
-#include <cstring>
 #endif
 
 /** Main function */

others/paranthesis_matching.cpp

@@ -5,11 +5,11 @@
  * @note Implementation is C-type and does not utilize the C++ constructs
  * @todo implement as a C++ class
  */
-#include <iostream>
+#include <iostream>  // for operator<<, basic_ostream, cout, basic_istream, cin
+#include <string>    // for basic_string, operator>>, string
 #ifdef _MSC_VER
-#include <string>  // Visual Studio C requires this include
+#include <string>    // for basic_string, operator>>, string
 #else
-#include <cstring>
 #endif
 
 /** check number */

others/postfix_evaluation.cpp

@@ -10,11 +10,13 @@
  * Evaluate the operator and push the result back to the stack
  * When the expression is ended, the number in the stack is the final answer
  */
+#include <ctype.h>    // for isdigit
 #include <algorithm>  // for all_of
-#include <array>      // for std::array
+#include <array>      // for array
 #include <cassert>    // for assert
-#include <iostream>   // for io operations
-#include <string>     // for stof
+#include <iostream>   // for operator<<, basic_ostream, cout
+#include <string>     // for basic_string, char_traits, string, stof
+#include <cstddef>    // for size_t
 
 /**
  * @namespace others

others/smallest_circle.cpp

@@ -7,9 +7,10 @@
  * @see [other
  * implementation](https://www.nayuki.io/page/smallest-enclosing-circle)
  */
-#include <cmath>
-#include <iostream>
-#include <vector>
+#include <cmath>     // for sqrt, INFINITY
+#include <cstddef>   // for size_t
+#include <iostream>  // for basic_ostream, char_traits, cout, endl, operator<<
+#include <vector>    // for vector
 
 /** Define a point */
 struct Point {