Small corrections

luku01.tex

@@ -77,8 +77,8 @@ is not an unfair advantage in the contest.
 All examples in this book are written in C++,
 and the data structures and algorithms in
 the standard library are often used.
-The standard is C++11 that can be used in most
-contests.
+The book follows the C++11 standard
+that can be used in most contests nowadays.
 If you can't program in C++ yet,
 now it is a good time to start learning.
 
@@ -93,19 +93,19 @@ looks like this:
 using namespace std;
 
 int main() {
-    // koodi tulee tähän
+    // solution comes here
 }
 \end{lstlisting}
 
 The \texttt{\#include} line at the beginning
-is a feature in the \texttt{g++} compiler
+of the code is a feature in the \texttt{g++} compiler
 that allows to include the whole standard library.
 Thus, it is not needed to separately include
 libraries such as \texttt{iostream},
 \texttt{vector} and \texttt{algorithm},
 but they are available automatically.
 
-The following \texttt{using} line determines
+The \texttt{using} line determines
 that the standard library can be used directly
 in the code.
 Without the \texttt{using} line we should write,