new coord stuff from 09

lib/include/aocpp/Coord.hpp

@@ -41,8 +41,16 @@ auto CCW(Coord) -> Coord;
 
 auto Turn180(Coord) -> Coord;
 
+/// @brief Computes the "1 norm" of a coordinate as a vector
+/// @param  vector
+/// @return Sum of magnitudes of components
 auto Norm1(Coord) -> std::int64_t;
 
+/// @brief Computes the "infinity norm" of a coordinate as a vector
+/// @param  vector
+/// @return Magnitude of the largest component
+auto NormInf(Coord) -> std::int64_t;
+
 /// Add two coordinates pairwise
 auto operator+(Coord, Coord) -> Coord;