Initial commit

2 files changed, 57 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..79e4712
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+CXXFLAGS=-O2 -Wall
+
+all: spark
+
+spark: src/main.cpp
+	g++ $(CXXFLAGS) -o spark src/main.cpp
+
+clean:
+	rm -f spark
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..95b9140
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,48 @@
+#include <cmath>
+#include <algorithm>
+#include <iostream>
+#include <iterator>
+#include <sstream>
+#include <vector>
+
+const char *TICKS[] = {"▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"};
+const size_t NUM_TICKS = 8;
+const double EPSILON = 1e-8;
+
+template<typename T>
+void sparkify(const std::vector<T> &values, std::ostringstream &out) {
+    auto minmax = std::minmax_element(values.begin(), values.end());
+    auto min = *minmax.first,
+         max = *minmax.second;
+    auto values_range = max - min;
+
+    if (abs(values_range) < EPSILON) {
+        auto it = std::ostream_iterator<const char *>(out);
+        std::fill_n(it, values.size(), TICKS[0]);
+    } else {
+        auto coef = (NUM_TICKS - 1) / values_range;
+        for (const T &x: values) {
+            out << TICKS[(size_t) round((x - min) * coef)];
+        }
+    }
+}
+
+int main()
+{
+    std::vector<double> values;
+    std::ostringstream out;
+    for (double value; std::cin >> value;) {
+        values.push_back(value);
+    }
+    if (!std::cin.eof() && std::cin.fail()) {
+        std::cerr << "Parse error" << std::endl;
+        return 1;
+    }
+    if (values.empty()) {
+        return 0;
+    }
+
+    sparkify(values, out);
+    std::cout << out.str() << std::endl;
+    return 0;
+}