submatrix.cpp: In function `int main()': submatrix.cpp:8: warning: `int cs' might be used uninitialized in this function submatrix.cpp:8: warning: `int ls' might be used uninitialized in this function submatrix.cpp:8: warning: `int cj' might be used uninitialized in this function submatrix.cpp:8: warning: `int lj' might be used uninitialized in this function submatrix.cpp:68:2: warning: no newline at end of file