Compilare: user.cpp: In function ‘int main()’: user.cpp:14:9: warning: unused variable ‘p1’ [-Wunused-variable] int p1, p2; ^ user.cpp:14:13: warning: unused variable ‘p2’ [-Wunused-variable] int p1, p2; ^ user.cpp:12:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("par.in", "r", stdin); ^ user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("par.out", "w", stdout); ^ user.cpp:17:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %s", &n, s); ^