Compilare: main.cpp: In function 'void x(int)': main.cpp:23:8: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (val(k)) ^ main.cpp: In function 'int main()': 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:32:39: 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:33:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n1); ^