Compilare: user.cpp: In function ‘int main()’: user.cpp:80:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,m,mn,id; ^ user.cpp:80:15: warning: unused variable ‘m’ [-Wunused-variable] int i,j,k,m,mn,id; ^ user.cpp:81:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("home.in", "r", stdin); ^ user.cpp:82:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("home.out", "w", stdout); ^ user.cpp:83:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:91:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s[i]+1); ^