View Compilation Error

0_0_29854993_25584.cpp: In function 'int main()':
0_0_29854993_25584.cpp:23:18: error: 'class std::vector<std::pair<int, int> >' has no member named 'pb'
             f[r].pb(pii(l,x));
                  ^
0_0_29854993_25584.cpp:40:33: error: 'struct std::pair<int, int>' has no member named 'x'
                     if (1+(j>=u.x)+(k>=u.x)+(t>=u.x)!=u.y) {
                                 ^
0_0_29854993_25584.cpp:40:42: error: 'struct std::pair<int, int>' has no member named 'x'
                     if (1+(j>=u.x)+(k>=u.x)+(t>=u.x)!=u.y) {
                                          ^
0_0_29854993_25584.cpp:40:51: error: 'struct std::pair<int, int>' has no member named 'x'
                     if (1+(j>=u.x)+(k>=u.x)+(t>=u.x)!=u.y) {
                                                   ^
0_0_29854993_25584.cpp:40:57: error: 'struct std::pair<int, int>' has no member named 'y'
                     if (1+(j>=u.x)+(k>=u.x)+(t>=u.x)!=u.y) {
                                                         ^