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Coding for Interviews: Max Consecutive Sum
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| <html> | |
| <head> | |
| <title>Max Consecutive Sum</title> | |
| </head> | |
| <body> | |
| Enter some integers: | |
| <input type="text" id="txtInput" value="-1 5 6 -2 20 -50 4"></input> | |
| <button onClick="btnOnClick();">Calculate</button> | |
| <p> | |
| Max consecutive sum is: <span id="divResult"></span> | |
| </p> | |
| <script> | |
| function maxConsecutiveSum(numbers) { | |
| var start = 0; | |
| var end = 1; | |
| var current_sum = numbers[0]; | |
| var max_sum = 0; | |
| while (true) { | |
| if (current_sum > max_sum) { | |
| max_sum = current_sum; | |
| } | |
| if (current_sum < 0) { | |
| current_sum -= numbers[start++]; | |
| continue; | |
| } | |
| if (end == numbers.length) { | |
| break; | |
| } | |
| current_sum += numbers[end++]; | |
| } | |
| return max_sum; | |
| } | |
| function btnOnClick() { | |
| var txtInput = document.getElementById("txtInput"); | |
| var integers = txtInput.value.split(" "); | |
| for (var i = 0; i < integers.length; ++i) { | |
| integers[i] = parseInt(integers[i]); | |
| } | |
| var maxSum = maxConsecutiveSum(integers); | |
| var divResult = document.getElementById("divResult"); | |
| divResult.innerHTML = maxSum; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| def max_consecutive_sum(numbers): | |
| """Returns the maximum consecutive sum from the specified numbers.""" | |
| assert len(numbers) | |
| start = 0 | |
| end = 1 | |
| current_sum = max_sum = 0 | |
| while True: | |
| max_sum = max(current_sum, max_sum) | |
| if current_sum < 0: | |
| current_sum -= numbers[start] | |
| start += 1 | |
| continue | |
| if end == len(numbers): | |
| break | |
| current_sum += numbers[end] | |
| end += 1 | |
| return max_sum | |
| def main(): | |
| import sys | |
| numbers = map(int, sys.argv[1:]) | |
| print max_consecutive_sum(numbers) | |
| if __name__ == "__main__": | |
| main() |
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