Compilare: user.cpp: In function ‘void make_prefix(int)’: user.cpp:52:9: warning: unused variable ‘i’ [-Wunused-variable] int i,q = 0; ^ user.cpp: In function ‘int make_match(int, int)’: user.cpp:64:9: warning: unused variable ‘i’ [-Wunused-variable] int i, q = 0; ^ user.cpp: In function ‘void read()’: user.cpp:33:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&T); ^ user.cpp:37:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&M); ^ user.cpp:40:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp: In function ‘int main()’: user.cpp:120:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbnr.in","r",stdin); ^ user.cpp:121:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbnr.out","w",stdout); ^