View Compilation Error

0_0_25320959_20685.cpp: In function 'int main()':
0_0_25320959_20685.cpp:93:18: error: 's1' was not declared in this scope
             cin>>s1>>s2>>t;
                  ^
0_0_25320959_20685.cpp:93:22: error: 's2' was not declared in this scope
             cin>>s1>>s2>>t;
                      ^