Adding medium/hard puzzles & challenges...

puzzles/medium/stock-exchange-losses.cpp

@@ -0,0 +1,61 @@
+// https://www.codingame.com/ide/puzzle/stock-exchange-losses
+// Xavier Morel - 2016-03-16
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+
+
+/**
+ * Auto-generated code below aims at helping you parse
+ * the standard input according to the problem statement.
+ **/
+int main()
+{
+    int n;
+    cin >> n; cin.ignore();
+    vector<int> history;
+    int last_high = 0;
+    int last_low = 0;
+    int prev = 0;
+    for (int i = 0; i < n; i++) {
+        int v;
+        cin >> v; cin.ignore();
+
+        if (i == 0) {
+            last_high = v;
+            last_low = v;
+            continue;
+        } else {
+            if (v > last_high) {
+                if (last_high != last_low) {
+                    history.push_back(last_high);
+                    history.push_back(last_low);
+                }
+                last_high = v;
+                last_low = v;
+            } else if (v < last_low) {
+                last_low = v;
+            }
+        }
+    }
+
+    if (last_high != last_low) {
+        history.push_back(last_high);
+        history.push_back(last_low);
+    }
+
+    int max_loss = 0;
+    for (vector<int>::iterator it = history.begin(); it != history.end(); it++) {
+        int loss = *min_element(it, history.end()) - *it;
+        if (loss < max_loss) {
+            max_loss = loss;
+        }
+    }
+
+    cout << max_loss << endl;
+}