Avoid the need to cast/convert to size_t for vector operations

Author: theuni

src/sketch.h

@@ -29,7 +29,7 @@ class Sketch
     virtual ~Sketch() {}
     virtual size_t Syndromes() const = 0;
 
-    virtual void Init(int syndromes) = 0;
+    virtual void Init(size_t syndromes) = 0;
     virtual void Add(uint64_t element) = 0;
     virtual void Serialize(unsigned char*) const = 0;
     virtual void Deserialize(const unsigned char*) = 0;

src/sketch_impl.h

@@ -366,7 +366,7 @@ class SketchImpl final : public Sketch
     }
 
     size_t Syndromes() const override { return m_syndromes.size(); }
-    void Init(int count) override { m_syndromes.assign(count, 0); }
+    void Init(size_t count) override { m_syndromes.assign(count, 0); }
 
     void Add(uint64_t val) override
     {