/in/foo.cc: In function 'void SSSP(int, int, std::vector<Patch>&)':
/in/foo.cc:26:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, k, u, v, N;
            ^
/in/foo.cc:26:15: warning: unused variable 'k' [-Wunused-variable]
     int i, j, k, u, v, N;
               ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:67:21: warning: unused variable 'k' [-Wunused-variable]
     int n, m, i, j, k, weight;
                     ^