/in/foo.cc: In function 'void SPFA()':
/in/foo.cc:34:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, k, z, newz, x, y, newx, newy, front, rear;
            ^
/in/foo.cc:34:15: warning: unused variable 'k' [-Wunused-variable]
     int i, j, k, z, newz, x, y, newx, newy, front, rear;
               ^
/in/foo.cc: In function 'void DP()':
/in/foo.cc:75:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, k, top, z, x, y, newx, newy, newz;
            ^
/in/foo.cc:75:15: warning: unused variable 'k' [-Wunused-variable]
     int i, j, k, top, z, x, y, newx, newy, newz;
               ^
/in/foo.cc: In function 'void solve()':
/in/foo.cc:111:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, k;
            ^
/in/foo.cc:111:15: warning: unused variable 'k' [-Wunused-variable]
     int i, j, k;
               ^