Compilare: main.cpp: In function 'void permutari(int, std::vector<int>&, std::vector<int>&)': main.cpp:9:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (current.size() == n) ~~~~~~~~~~~~~~~^~~~ main.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nums.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:9: warning: unused variable 'j' [-Wunused-variable] int j = 0; ^ main.cpp:31:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permutari.in", "r", stdin); ^ main.cpp:32:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permutari.out", "w", stdout); ^ main.cpp:35:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^