View Compilation Error

0_0_37761682_21779.cpp: In function 'int main()':
0_0_37761682_21779.cpp:41:20: error: 'segj' was not declared in this scope
    while(j <= n && segj.fi <= segi.se ){
                    ^
0_0_37761682_21779.cpp:41:31: error: 'segi' was not declared in this scope
    while(j <= n && segj.fi <= segi.se ){
                               ^
0_0_37761682_21779.cpp:42:27: error: could not convert '{<expression error>, ql[j]}' from '<brace-enclosed initializer list>' to 'std::pair<int, int>'
     PII t = {segj.se,ql[j]};
                           ^