View Compilation Error

0_0_32363339_26974.cpp: In function 'int main()':
0_0_32363339_26974.cpp:46:17: error: 'size' was not declared in this scope
     if(ti==size()-1)
                 ^
0_0_32363339_26974.cpp:55:17: error: 'size' was not declared in this scope
     if(ti==size()-1)
                 ^