comp.cpp: In function `int sign()': comp.cpp:11: warning: comparison between signed and unsigned integer expressions comp.cpp: In function `int solve1()': comp.cpp:30: warning: comparison between signed and unsigned integer expressions comp.cpp:41: warning: comparison between signed and unsigned integer expressions comp.cpp:59: warning: control reaches end of non-void function comp.cpp: In function `void solve2()': comp.cpp:63: warning: comparison between signed and unsigned integer expressions comp.cpp:74: warning: comparison between signed and unsigned integer expressions