scara2.cpp: In function `void Read()': scara2.cpp:36: warning: comparison between signed and unsigned integer expressions scara2.cpp:39: warning: comparison between signed and unsigned integer expressions scara2.cpp: In function `std::pair<int, int> Solve()': scara2.cpp:47: warning: comparison between signed and unsigned integer expressions scara2.cpp:49: warning: comparison between signed and unsigned integer expressions scara2.cpp:67: warning: control reaches end of non-void function