View Compilation Error

0_0_15286293_27529.cpp: In function 'int cal2(int, int)':
0_0_15286293_27529.cpp:152:5: error: redefinition of 'int cal2(int, int)'
 int cal2(int i,int j)
     ^
0_0_15286293_27529.cpp:125:5: note: 'int cal2(int, int)' previously defined here
 int cal2(int i,int j)
     ^
0_0_15286293_27529.cpp: In function 'int cal(int)':
0_0_15286293_27529.cpp:189:32: error: 'cal3' was not declared in this scope
             a[len++] = cal3(i,j);
                                ^