From ef088b4ab4fdafeef32fa9b65a2c76601112457b Mon Sep 17 00:00:00 2001
From: Vahagn Khachatryan <vahagn.khachatryan@gmail.com>
Date: Sun, 8 Feb 2015 23:05:24 +0400
Subject: [PATCH] tom tom interview.

---
 interviews/tomtom/tomtom_demo.cpp  | 52 ++++++++++++++++++
 interviews/tomtom/tomtom_test1.cpp | 51 +++++++++++++++++
 interviews/tomtom/tomtom_test2.cpp | 57 +++++++++++++++++++
 interviews/tomtom/tomtom_test3.cpp | 88 ++++++++++++++++++++++++++++++
 4 files changed, 248 insertions(+)
 create mode 100644 interviews/tomtom/tomtom_demo.cpp
 create mode 100644 interviews/tomtom/tomtom_test1.cpp
 create mode 100644 interviews/tomtom/tomtom_test2.cpp
 create mode 100644 interviews/tomtom/tomtom_test3.cpp

diff --git a/interviews/tomtom/tomtom_demo.cpp b/interviews/tomtom/tomtom_demo.cpp
new file mode 100644
index 0000000..9cef397
--- /dev/null
+++ b/interviews/tomtom/tomtom_demo.cpp
@@ -0,0 +1,52 @@
+/*
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+VIM: let g:argv=""
+*/
+#include <iostream>
+#include <stdexcept>
+#include <vector>
+#include <algorithm>
+#include <string>
+
+int solution( std::vector<int> & a ) 
+{
+	long long s = 0;
+	for ( auto it = a.begin(), ie=a.end(); it != ie; ++it ) {
+		s += *it;
+	}
+
+	long long t = 0;
+	for ( auto it = a.begin(), ie=a.end(); it != ie; ++it ) {
+		if ( (s-*it)%2 == 0 && t == (s-*it)/2 )
+			return it - a.begin();
+		t += *it;
+	}
+	return -1;
+}
+
+int main ( void )
+{try{
+#if 1
+	std::vector<int> a = {
+		-1,3,-4,5,1,-6,2,1
+	};
+
+	std::cout << solution( a ) << std::endl;
+	
+#endif
+	return 0;
+}
+catch ( const std::exception& e )
+{
+	std::cerr << std::endl
+			<< "std::exception(\"" << e.what() << "\")." << std::endl;
+	return 2;
+}
+catch ( ... )
+{
+	std::cerr  << std::endl
+			<< "unknown exception." << std::endl;
+	return 1;
+}}
+
diff --git a/interviews/tomtom/tomtom_test1.cpp b/interviews/tomtom/tomtom_test1.cpp
new file mode 100644
index 0000000..3b14b48
--- /dev/null
+++ b/interviews/tomtom/tomtom_test1.cpp
@@ -0,0 +1,51 @@
+/*
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+VIM: let g:argv=""
+*/
+#include <iostream>
+#include <stdexcept>
+#include <vector>
+#include <algorithm>
+#include <string>
+
+int solution( std::vector<int> & a ) 
+{
+	auto n = a.size();
+
+	int i = 0;
+	for (int c = 0; c < n; ++c ) {
+		auto new_i = i + a[i];
+		if (new_i < 0 || n <= new_i)
+			return i;
+		i = new_i;
+	}
+
+	return -1;
+}
+
+int main ( void )
+{try{
+#if 1
+	std::vector<int> a = {
+		2,3,-1,1,-1
+	};
+
+	std::cout << solution( a ) << std::endl;
+	
+#endif
+	return 0;
+}
+catch ( const std::exception& e )
+{
+	std::cerr << std::endl
+			<< "std::exception(\"" << e.what() << "\")." << std::endl;
+	return 2;
+}
+catch ( ... )
+{
+	std::cerr  << std::endl
+			<< "unknown exception." << std::endl;
+	return 1;
+}}
+
diff --git a/interviews/tomtom/tomtom_test2.cpp b/interviews/tomtom/tomtom_test2.cpp
new file mode 100644
index 0000000..597a460
--- /dev/null
+++ b/interviews/tomtom/tomtom_test2.cpp
@@ -0,0 +1,57 @@
+/*
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+VIM: let g:argv=""
+*/
+#include <iostream>
+#include <stdexcept>
+#include <vector>
+#include <algorithm>
+#include <string>
+
+int solution( std::vector<int> & a ) 
+{
+	int max_e = 10001; //
+	std::vector<int> c(max_e, 0);
+	
+	for ( auto e : a ) {
+		++c[e];
+	}
+
+	int m = 0;
+	int mi = 0;
+	for ( auto it = c.begin(); it != c.end(); ++it ) {
+		if (*it > m)
+		{
+			m = *it;
+			mi = it - c.begin();
+		}
+	}
+	return mi;
+}
+
+int main ( void )
+{try{
+#if 1
+	std::vector<int> a = {
+		0, 0, 1, 2, 0, 10000, 10000, 10000
+	};
+
+	std::cout << solution( a ) << std::endl;
+	
+#endif
+	return 0;
+}
+catch ( const std::exception& e )
+{
+	std::cerr << std::endl
+			<< "std::exception(\"" << e.what() << "\")." << std::endl;
+	return 2;
+}
+catch ( ... )
+{
+	std::cerr  << std::endl
+			<< "unknown exception." << std::endl;
+	return 1;
+}}
+
diff --git a/interviews/tomtom/tomtom_test3.cpp b/interviews/tomtom/tomtom_test3.cpp
new file mode 100644
index 0000000..60df41f
--- /dev/null
+++ b/interviews/tomtom/tomtom_test3.cpp
@@ -0,0 +1,88 @@
+/*
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+VIM: let g:argv=""
+*/
+#include <iostream>
+#include <stdexcept>
+#include <vector>
+#include <algorithm>
+#include <string>
+
+/*
+int solution(vector<int>& A) {
+	int n = A.size();
+	int i = n - 1;
+	int result = -1;
+	int k = 0;
+	int maximal = 0;
+	while (i > 0) {
+		if (A[i] == 1) {
+			k = k + 1;
+			if (k >= maximal) {
+				maximal = k;
+				result = i;
+			}
+		}
+		else {
+			k = 0;
+		}
+		i = i - 1;
+	}
+	if (A[i] == 1 && k + 1 > maximal)
+		result = 0;
+	return result;
+}
+*/
+
+using namespace std;
+
+int solution(vector<int>& A) {
+	int n = A.size();
+	int i = n - 1;
+	int result = -1;
+	int k = 0;
+	int maximal = 0;
+	while (i > 0) {
+		if (A[i] == 1) {
+			k = k + 1;
+			if (k >= maximal) {
+				maximal = k;
+				result = i;
+			}
+		}
+		else {
+			k = 0;
+		}
+		i = i - 1;
+	}
+	if (A[i] == 1 && k + 1 >= maximal)
+		result = 0;
+	return result;
+}
+
+int main ( void )
+{try{
+#if 1
+	std::vector<int> a = {
+		1,1,1,0,1,1,1,0,1
+	};
+
+	std::cout << solution( a ) << std::endl;
+	
+#endif
+	return 0;
+}
+catch ( const std::exception& e )
+{
+	std::cerr << std::endl
+			<< "std::exception(\"" << e.what() << "\")." << std::endl;
+	return 2;
+}
+catch ( ... )
+{
+	std::cerr  << std::endl
+			<< "unknown exception." << std::endl;
+	return 1;
+}}
+