diff --git a/Makefile b/Makefile
index 8be0a33..67782a7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CXXFLAGS = -Wall -O3
 
-all: split1 split2 split6 split7 split8 split9 splitc1 splitc2 splitc3 split_subparser
+all: split1 split2 split6 split7 split8 split9 splitc1 splitc2 splitc3 split_subparser split10 split11 split12 
 
 split7: split7.cpp | deps/strtk
 	$(CXX) $(LDFLAGS) -Ideps/strtk/ $(CXXFLAGS) split7.cpp -o split7
@@ -12,7 +12,7 @@ split_subparser: split_subparser.cpp | deps/json_parser
 .PHONY: clean update-deps
 
 clean:
-	@rm -f split1 split2 split6 split7 split8 split9 splitc1 splitc2 splitc3 split_subparser
+	@rm -f split1 split2 split6 split7 split8 split9 splitc1 splitc2 splitc3 split_subparser split10 split11 split12
 
 update-deps: deps
 	git --git-dir=deps/strtk/.git/ --work-tree=deps/strtk/ fetch origin
diff --git a/split10.cpp b/split10.cpp
new file mode 100644
index 0000000..13a1968
--- /dev/null
+++ b/split10.cpp
@@ -0,0 +1,54 @@
+// http://stackoverflow.com/a/9379203/106471
+#include <iostream>                                                              
+#include <iomanip>
+#include <string>
+#include <sstream>
+#include <ctime>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+void split(vector<string> &ret, const string& s, char delimiter=' ')
+{
+    ret.clear();
+    for(auto itStart = s.begin(), itDelim = itStart, itEnd = s.end(); itStart < itEnd; itStart = itDelim + 1)
+    {
+        itDelim = find(itStart, itEnd, delimiter);
+        ret.emplace_back(string(itStart, itDelim));
+    }
+}
+
+
+
+int main() {
+    string input_line;
+    long count = 0;
+    timespec start;
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    cin.sync_with_stdio(false); //disable synchronous IO
+    size_t numWords = 0;
+    size_t numChars = 0;
+
+    vector<string> words;
+    while(getline(cin, input_line)) 
+    {
+        split(words, input_line);
+        numWords += words.size();
+        for(const auto &s:words)
+            numChars += s.size();
+        count++;
+    };
+
+    timespec end;
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    const double sec = (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) * 1e-9;
+    cerr << "C++   : Saw " << count << " lines (" << numWords << " words/" << numChars << " chars) in " << fixed << setprecision(1) << sec << " seconds." ;
+    if (sec > 0) {
+        const double lps = count / sec;
+        cerr << "  Crunch speed: " << fixed << setprecision(1) << lps << endl;
+    } else
+        cerr << endl;
+    return 0;
+}
diff --git a/split11.cpp b/split11.cpp
new file mode 100644
index 0000000..4e991b2
--- /dev/null
+++ b/split11.cpp
@@ -0,0 +1,69 @@
+// http://stackoverflow.com/a/9379203/106471
+#include <iostream>                                                              
+#include <iomanip>
+#include <string>
+#include <sstream>
+#include <ctime>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+class StringRef
+{
+private:
+    const char* m_itBeg;
+    int m_iSize;
+    
+public:
+    inline int size() const { return m_iSize; }
+    const char* begin() { return m_itBeg; }
+    const char* end() const { return m_itBeg + m_iSize; }
+    
+    StringRef(const char* &beg, const char* &nd)
+    : m_itBeg(beg)
+    , m_iSize(nd - beg)
+    {}
+};
+
+int split(vector<StringRef> &ret, const string& s, const char delimiter = ' ')
+{
+    for(auto ps = &s[0], pd = ps, pe = ps + s.size(); ps < pe; ps = pd + 1)
+    {
+        ret.emplace_back(StringRef(ps, pd = find(ps, pe, delimiter)));
+    }
+    return ret.size();
+}
+
+int main() {
+    string input_line;
+    long count = 0;
+    timespec start;
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    cin.sync_with_stdio(false); //disable synchronous IO
+    size_t numWords = 0;
+    size_t numChars = 0;
+
+    vector<StringRef> words;
+    words.reserve(100);
+    while(getline(cin, input_line)) 
+    {
+        words.clear();
+        numWords += split(words, input_line);
+        for(const auto &s:words)
+            numChars += s.size();
+        count++;
+    };
+
+    timespec end;
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    const double sec = (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) * 1e-9;
+    cerr << "C++   : Saw " << count << " lines (" << numWords << " words/" << numChars << " chars) in " << fixed << setprecision(1) << sec << " seconds." ;
+    if (sec > 0) {
+        const double lps = count / sec;
+        cerr << "  Crunch speed: " << fixed << setprecision(1) << lps << endl;
+    } else
+        cerr << endl;
+    return 0;
+}
diff --git a/split12.cpp b/split12.cpp
new file mode 100644
index 0000000..22a4bb0
--- /dev/null
+++ b/split12.cpp
@@ -0,0 +1,72 @@
+// http://stackoverflow.com/a/9379203/106471
+#include <iostream>                                                              
+#include <iomanip>
+#include <string>
+#include <cstring>
+#include <sstream>
+#include <ctime>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+class StringRef
+{
+private:
+    const char* m_itBeg;
+    int m_iSize;
+    
+public:
+    inline int size() const { return m_iSize; }
+    const char* begin() { return m_itBeg; }
+    const char* end() const { return m_itBeg + m_iSize; }
+    
+    StringRef(const char* &beg, const char* &nd)
+    : m_itBeg(beg)
+    , m_iSize(nd - beg)
+    {}
+};
+
+int split(vector<StringRef> &ret, const string& s, const char delimiter = ' ')
+{
+    auto ps = &s[0], pd = ps, pe = ps + s.size();
+    for(;pd; ps = pd + 1)
+    {
+        pd = (const char *)memchr(ps, delimiter, pe - ps);
+        ret.emplace_back(StringRef(ps, pd ? pd : pe));
+    }
+    return ret.size();
+}
+
+int main() {
+    string input_line;
+    long count = 0;
+    timespec start;
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    cin.sync_with_stdio(false); //disable synchronous IO
+    size_t numWords = 0;
+    size_t numChars = 0;
+
+    vector<StringRef> words;
+    words.reserve(100);
+    while(getline(cin, input_line)) 
+    {
+        words.clear();
+        numWords += split(words, input_line);
+        for(const auto &s:words)
+            numChars += s.size();
+        count++;
+    };
+
+    timespec end;
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    const double sec = (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) * 1e-9;
+    cerr << "C++   : Saw " << count << " lines (" << numWords << " words/" << numChars << " chars) in " << fixed << setprecision(1) << sec << " seconds." ;
+    if (sec > 0) {
+        const double lps = count / sec;
+        cerr << "  Crunch speed: " << fixed << setprecision(1) << lps << endl;
+    } else
+        cerr << endl;
+    return 0;
+}