View Compilation Error

0_0_24490657_18190.cpp: In function 'int main()':
0_0_24490657_18190.cpp:17:46: error: expected ';' before 'puts'
         else(n==4&&a[0]==1&&a[1]==2&&a[2]==2)puts("Yes");
                                              ^
0_0_24490657_18190.cpp:18:9: error: 'else' without a previous 'if'
         else puts("No");
         ^