task_2.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cout << "Nhap s: "; getline(cin, s);
  // task_a
  while (s[0] == ' ') s.erase(0, 1);
  while (s[s.size() - 1] == ' ') s.erase(s.size() - 1, 1);
  while (s.find("  ") != -1) {
    int vt = s.find("  ");
    s.erase(vt, 1);
  }
  cout << "Ket qua: " << s << endl;
  // task_b
  int tu = 1;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == ' ') tu++;
  }
  cout << "So tu: " << tu << endl;
  // task_c
  string dau, cuoi;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == ' ') break;
    dau += s[i];
  }
  for (int i = s.size() - 1; i >= 0; i--) {
    if (s[i] == ' ') break;
    cuoi = s[i] + cuoi;
  }
  cout << "Tu dau: " << dau << endl;
  cout << "Tu cuoi: " << cuoi << endl;
  // task_d
  bool dx = 1;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] != s[s.size() - 1 - i]) dx = 0;
  }
  if (dx) cout << "s la xau doi xung" << endl;
  else cout << "s khong la xau doi xung" << endl;
  // task_e
  while (s.find("anh") != -1) {
    int vt = s.find("anh");
    s.erase(vt, 3);
    s.insert(vt, "em");
  }
  cout << "Ket qua: " << s << endl;
}