Compilare: main.cpp: In function 'int main()': main.cpp:13:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(o) ^ main.cpp:7:89: 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),freopen("permutari.out","w",stdout),scanf("%d",&n); ^ main.cpp:7:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:7:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]