regat.cpp: In function `void DF(int, int)': regat.cpp:86: warning: comparison between signed and unsigned integer expressions regat.cpp:85: warning: unused variable `int cnt' regat.cpp: In function `void compute(int)': regat.cpp:105: warning: comparison between signed and unsigned integer expressions regat.cpp:110: warning: comparison between signed and unsigned integer expressions regat.cpp:97: warning: unused variable `int x' regat.cpp:97: warning: unused variable `int y' regat.cpp: In function `int main()': regat.cpp:160: warning: comparison between signed and unsigned integer expressions