Prepare for challenge 076

1 files changed, 41 insertions, 0 deletions

diff --git a/challenge-075/ash/cpp/ch-2.cpp b/challenge-075/ash/cpp/ch-2.cpp
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+++ b/challenge-075/ash/cpp/ch-2.cpp
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+/*
+    Task 2 from https://perlweeklychallenge.org/blog/perl-weekly-challenge-075/
+ 
+    Comments: https://andrewshitov.com/2020/08/29/largest-rectangle-histogram-the-raku-challenge-week-75-task-2/
+
+    How to compile: 
+    $ g++ --std=c++17 ch-2.cpp
+*/
+
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+int main() {
+    vector<int> hist = {3, 2, 3, 5, 7, 5};
+
+    int max_area = 0;
+    int max_start;
+    int max_end;
+
+    for (auto start = 0; start <= hist.size(); start++) {
+        for (auto end = start + 1; end < hist.size(); end++) {
+            auto min_height = INT_MAX;
+            for (auto i = start; i != end; i++) {
+                if (hist[i] < min_height) min_height = hist[i];
+            }
+
+            auto area = min_height * (1 + end - start);
+
+            if (area > max_area) {
+                max_area = area;
+                max_start = start;
+                max_end = end;
+            }
+        }
+    }
+
+    cout << "The biggest rectangle is between the columns " << max_start << " and " << max_end 
+        << " and its area is " << max_area << ".\n";
+}