Compilare: user.cpp: In function ‘int main()’: user.cpp:41:59: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(st[i][nr_st[i]]!=-1&&d[i][st[i][nr_st[i]]][q]!=-1) ^ user.cpp:45:57: warning: array subscript has type ‘char’ [-Wchar-subscripts] st[i][nr_st[i]]=d[i][st[i][nr_st[i]-1]][q]; ^ user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("search.in","r",stdin); ^ user.cpp:9:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("search.out","w",stdout); ^ user.cpp:10:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ",&n,&m); ^ user.cpp:13:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:34:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c ",&q); ^ /tmp/ccn941d2.o: In function `main': user.cpp:(.text.startup+0x8f): warning: the `gets' function is dangerous and should not be used.