Compilare: user.cpp: In function ‘int main()’: user.cpp:65:9: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int n, m, a, ans, t, x, y, i, j, k, st, dr; ^ user.cpp: In function ‘char nextch()’: user.cpp:22:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos=0; ^