Compilare: user.cpp: In function ‘char nextch()’: user.cpp:12:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fin); ^ user.cpp: In function ‘int update(int)’: user.cpp:34:17: warning: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Wstrict-overflow] if((a<i)||(b>j)||(j+l>b+t)||(i-l<a-t)||((j+l-1)-b+a-(i-l+1)>=t)) return INF; ^ user.cpp:34:10: warning: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Wstrict-overflow] if((a<i)||(b>j)||(j+l>b+t)||(i-l<a-t)||((j+l-1)-b+a-(i-l+1)>=t)) return INF; ^ user.cpp: In function ‘int main()’: user.cpp:34:17: warning: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Wstrict-overflow] if((a<i)||(b>j)||(j+l>b+t)||(i-l<a-t)||((j+l-1)-b+a-(i-l+1)>=t)) return INF; ^ user.cpp:34:10: warning: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Wstrict-overflow] if((a<i)||(b>j)||(j+l>b+t)||(i-l<a-t)||((j+l-1)-b+a-(i-l+1)>=t)) return INF; ^