View Compilation Error

0_0_36824365_16804.cpp: In function 'int main()':
0_0_36824365_16804.cpp:9:54: error: too many initializers for 'int [11]'
     int s1[11] = {31,28,31,30,31,30,31,31,30,31,30,31};
                                                      ^
0_0_36824365_16804.cpp:10:54: error: too many initializers for 'int [11]'
     int s2[11] = {31,29,31,30,31,30,31,31,30,31,30,31};
                                                      ^
0_0_36824365_16804.cpp:16:14: error: lvalue required as left operand of assignment
     if((y%400=0)||((y%4==0)&&(y%100!=0)));
              ^
0_0_36824365_16804.cpp:24:5: error: 'else' without a previous 'if'
     else 
     ^
0_0_36824365_16804.cpp:27:15: error: 'i' was not declared in this scope
         s+=s1[i];
               ^