View Compilation Error

0_0_17022459_14099.cpp:5:1: error: 'usingnamespace' does not name a type
 usingnamespace std;
 ^
0_0_17022459_14099.cpp: In function 'bool dfs(int)':
0_0_17022459_14099.cpp:47:22: error: 'returnfalse' was not declared in this scope
 if(k+(h()+2)/3>deep) returnfalse;
                      ^
0_0_17022459_14099.cpp:54:14: error: 'returntrue' was not declared in this scope
 if(dfs(k+1)) returntrue;
              ^
0_0_17022459_14099.cpp:57:1: error: 'returnfalse' was not declared in this scope
 returnfalse;
 ^
0_0_17022459_14099.cpp: In function 'int main()':
0_0_17022459_14099.cpp:66:8: error: 'in' was not declared in this scope
 in(s[i]);
        ^