View Compilation Error

0_0_36502031_18114.cpp: In function 'int main()':
0_0_36502031_18114.cpp:34:26: error: 's1' was not declared in this scope
             while(j<n && s1[j].x>=s2[i].x)
                          ^
0_0_36502031_18114.cpp:34:35: error: 's2' was not declared in this scope
             while(j<n && s1[j].x>=s2[i].x)
                                   ^