nonogram.cpp: In function 'void SolveNonogram(int, int, std::vector<std::vector<int> >, std::vector<std::vector<int> >)':
nonogram.cpp:4:6: error: ambiguating new declaration of 'void SolveNonogram(int, int, std::vector<std::vector<int> >, std::vector<std::vector<int> >)'
void SolveNonogram(int N, int M, std::vector<std::vector<int>> Rclue, std::vector<std::vector<int>> Cclue) {
^~~~~~~~~~~~~
In file included from nonogram.cpp:1:0:
nonogram.h:3:31: note: old declaration 'std::vector<std::vector<int> > SolveNonogram(int, int, std::vector<std::vector<int> >, std::vector<std::vector<int> >)'
std::vector<std::vector<int>> SolveNonogram(int N, int M, std::vector<std::vector<int>> Rclue, std::vector<std::vector<int>> Cclue);
^~~~~~~~~~~~~