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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. #define endl "\n"
  4. #define F first
  5. #define S second
  6. #define loop(a,n) for(int i=a; i<=n ; i++)
  7. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  8. #define NAME "CH"
  9. using namespace std;
  10. string s,n,res;
  11. int k;
  12. void nhap(){
  13.     cin >> n;
  14.     cin.ignore();
  15.     getline(cin, s);
  16. }
  17. int op(string num, int x){
  18.     int res = 0;
  19.     for(int i=0;i<num.size();++i) {
  20.         res = (res * 10 + num[i] - '0') % x;
  21.     }
  22.     return res; 
  23. }
  24. string to_upper(string s){
  25.     for(int i = 0; i < s.size(); i++){
  26.         if(s[i] >= 'a' && s[i] <= 'z'){
  27.             s[i] -= 32;
  28.         }
  29.     }
  30.     return s;
  31. }
  32. string decode(string s, int k){
  33.     string res;
  34.     for(int i = 0; i < s.size(); ++i) {
  35.         if(s[i] == ' ') {
  36.             res += ' ';
  37.         } else {
  38.             char x = s[i] - k;
  39.             if (x < 'A') x += 26;
  40.             res += x;
  41.         }
  42.     }
  43.     return res;
  44. }
  45.  
  46. void solve(){
  47.     k = op(n, 26);
  48.     s = to_upper(s);
  49.     res = decode(s,k);
  50. }
  51. void xuat(){
  52.     cout<<res;
  53. }
  54. int main(){
  55.     ios_base::sync_with_stdio(0);
  56.     cin.tie(0);cout.tie(0);
  57.     freopen(NAME".INP","r",stdin);
  58.     freopen(NAME".OUT","w",stdout);
  59.     nhap();
  60.     solve();
  61.     xuat();
  62.     return 0;
  63. }
Success #stdin #stdout 0s 5328KB
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https://ideone.com/ENcPLc
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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