Rezumat problemă

Permutari

#123

Se citeşte un număr natural nenul n. Să se afişeze, în ordine lexicografică, permutările mulţimii {1,2,..,n}.

Fișiere Candale Silviu (silviu) ușoară

Clasa 11 Backtracking Elemente de combinatorică

Rezolvă

Detalii

Problema	Permutari	Operații I/O	permutari.in/permutari.out
Limita timp	0.5 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#64236731	Utilizator	Gavrila Mihai (Mihai6421)
Fișier	permutari.cpp	Dimensiune	697 B
Data încărcării	24 Aprilie 2026, 14:30	Scor/rezultat	Eroare de compilare

Evaluare

Mesaj compilare

permutari.cpp:4:14: error: extended character “ is not valid in an identifier
    4 | ifstream cin(“permutari.in”);
      |              ^
permutari.cpp:4:25: error: extended character ” is not valid in an identifier
    4 | ifstream cin(“permutari.in”);
      |                         ^
permutari.cpp:5:15: error: extended character “ is not valid in an identifier
    5 | ofstream cout(“permutari.out”);
      |               ^
permutari.cpp:5:26: error: extended character ” is not valid in an identifier
    5 | ofstream cout(“permutari.out”);
      |                          ^
permutari.cpp:8:49: error: extended character “ is not valid in an identifier
    8 | { for(int i = 1 ; i <= n ; i++) cout << x[i] << “ “; cout << endl;
      |                                                 ^
permutari.cpp:8:51: error: extended character “ is not valid in an identifier
    8 | { for(int i = 1 ; i <= n ; i++) cout << x[i] << “ “; cout << endl;
      |                                                   ^
permutari.cpp:4:14: error: ‘“permutari’ was not declared in this scope
    4 | ifstream cin(“permutari.in”);
      |              ^~~~~~~~~~
permutari.cpp:5:15: error: ‘“permutari’ was not declared in this scope
    5 | ofstream cout(“permutari.out”);
      |               ^~~~~~~~~~
permutari.cpp: In function ‘void afisare()’:
permutari.cpp:8:33: error: reference to ‘cout’ is ambiguous
    8 | { for(int i = 1 ; i <= n ; i++) cout << x[i] << “ “; cout << endl;
      |                                 ^~~~
In file included from permutari.cpp:1:
/usr/include/c++/13/iostream:63:18: note: candidates are: ‘std::ostream std::cout’
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
permutari.cpp:5:10: note:                 ‘std::ofstream cout’
    5 | ofstream cout(“permutari.out”);
      |          ^~~~
permutari.cpp:8:41: error: ‘x’ was not declared in this scope
    8 | { for(int i = 1 ; i <= n ; i++) cout << x[i] << “ “; cout << endl;
      |                                         ^
permutari.cpp:8:49: error: ‘“’ was not declared in this scope
    8 | { for(int i = 1 ; i <= n ; i++) cout << x[i] << “ “; cout << endl;
      |                                                 ^
permutari.cpp:8:54: error: reference to ‘cout’ is ambiguous
    8 | { for(int i = 1 ; i <= n ; i++) cout << x[i] << “ “; cout << endl;
      |                                                      ^~~~
/usr/include/c++/13/iostream:63:18: note: candidates are: ‘std::ostream std::cout’
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
permutari.cpp:5:10: note:                 ‘std::ofstream cout’
    5 | ofstream cout(“permutari.out”);
      |          ^~~~
permutari.cpp: In function ‘int valid(int)’:
permutari.cpp:12:37: error: ‘x’ was not declared in this scope
   12 |     for(int i = 1 ; i < k ; i++) if(x[i] x[k]) return 0; return 1; } void back(int k)
      |                                     ^
permutari.cpp:12:41: error: expected ‘)’ before ‘x’
   12 |     for(int i = 1 ; i < k ; i++) if(x[i] x[k]) return 0; return 1; } void back(int k)
      |                                    ~    ^~
      |                                         )
permutari.cpp:12:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
   12 |     for(int i = 1 ; i < k ; i++) if(x[i] x[k]) return 0; return 1; } void back(int k)
      |     ^~~
permutari.cpp:12:58: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
   12 |     for(int i = 1 ; i < k ; i++) if(x[i] x[k]) return 0; return 1; } void back(int k)
      |                                                          ^~~~~~
permutari.cpp: In function ‘void back(int)’:
permutari.cpp:15:3: error: ‘x’ was not declared in this scope
   15 | { x[k] = i; if(valid(k))///daca e valid (nu se repeta)
      |   ^
permutari.cpp:16:9: error: expected ‘)’ before ‘n’
   16 |     if(k n) afisare();///solutie
      |       ~ ^~
      |         )
permutari.cpp:15:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   15 | { x[k] = i; if(valid(k))///daca e valid (nu se repeta)
      |               ^
permutari.cpp:19:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   19 | int main()
      |         ^~
permutari.cpp:19:9: note: remove parentheses to default-initialize a variable
   19 | int main()
      |         ^~
      |         --
permutari.cpp:19:9: note: or replace parentheses with braces to value-initialize a variable
permutari.cpp:20:1: error: a function-definition is not allowed here before ‘{’ token
   20 | { cin >> n; back(1);///incep generarea de la 1
      | ^
permutari.cpp:22:2: error: expected ‘}’ at end of input
   22 | }
      |  ^
permutari.cpp:14:1: note: to match this ‘{’
   14 | { for(int i = 1 ; i <= n ; i++)///de unde se ia x[k]
      | ^

Cum funcționează evaluarea?