View Compilation Error

0_0_33539803_10557.cpp: In function 'int main()':
0_0_33539803_10557.cpp:26:31: error: 'robot' was not declared in this scope
             while(top > 0 && (robot[i].p == s[top].p) && (robot[i].a > s[top].a)) top--;
                               ^