View Compilation Error

0_0_33714401_16778.cpp: In function 'int main()':
0_0_33714401_16778.cpp:145:24: error: 'N' was not declared in this scope
  while (scanf("%d%d", &N, &m) != EOF) {
                        ^
0_0_33714401_16778.cpp:151:4: error: 'p' was not declared in this scope
    p[i] = make_pair(u, v);
    ^
0_0_33714401_16778.cpp:160:8: error: 'p' was not declared in this scope
    u = p[i].first;
        ^