View Compilation Error

0_0_28620621_20465.cpp: In function 'int main()':
0_0_28620621_20465.cpp:23:26: error: expected primary-expression before ';' token
            for(int i=n;i>;i++)
                          ^
0_0_28620621_20465.cpp:27:20: error: 'a' was not declared in this scope
                    a[i-1][j]+=max(a[i][j],a[i][j+1]);
                    ^
0_0_28620621_20465.cpp:31:18: error: 'a' was not declared in this scope
            cout<<a[1][1];
                  ^