View Compilation Error

0_0_15970467_7042.cpp: In function 'int main()':
0_0_15970467_7042.cpp:31:27: error: expected primary-expression before ';' token
             for(int j=0;j<;j++){
                           ^
0_0_15970467_7042.cpp:33:17: error: 'sum' was not declared in this scope
                 sum += a;
                 ^
0_0_15970467_7042.cpp:36:12: error: 'sum' was not declared in this scope
         if(sum%2 == (n+m-1)%2) puts("YES");
            ^