func_code_string: #include <bits/stdc++.h>   using namespace std;   struct habijabi {     long int start_time, end_time;   } work[500500];   bool cmp(habijabi a, habijabi b) {     if (a.end_time == b.end_time) {       return a.start_time < b.start_time;     }     return a.end_time < b.end_time;   }   int main() {     long int t, n, i, j;     scanf( %ld , &n);     for (i = 0; i < n; i++) {       scanf( %ld %ld , &work[i].start_time, &work[i].end_time);     }     sort(work, work + n, cmp);     int ans = 0, prev_end = -1;     for (i = 0; i < n; i++) {       if (work[i].start_time > prev_end) {         ans++;         prev_end = work[i].end_time;       }     }     printf( %d n , ans);     return 0;   }   