snipers.cpp:36:1: warning: "M_PI" redefined In file included from /usr/include/c++/4.4/cmath:46, from /usr/include/c++/4.4/complex:46, from snipers.cpp:9: /usr/include/math.h:366:1: warning: this is the location of the previous definition snipers.cpp: In function 'void solve(std::vector<Point, std::allocator<Point> >)': snipers.cpp:83: warning: comparison between signed and unsigned integer expressions snipers.cpp:89: warning: comparison between signed and unsigned integer expressions snipers.cpp:102: warning: comparison between signed and unsigned integer expressions snipers.cpp:116: warning: comparison between signed and unsigned integer expressions snipers.cpp: In function 'int main()': snipers.cpp:151: warning: comparison between signed and unsigned integer expressions snipers.cpp:127: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result snipers.cpp:128: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result