submatrix.cpp: In function `int main()': submatrix.cpp:36: warning: `int L1' might be used uninitialized in this function submatrix.cpp:36: warning: `int L2' might be used uninitialized in this function submatrix.cpp:36: warning: `int C1' might be used uninitialized in this function submatrix.cpp:36: warning: `int C2' might be used uninitialized in this function submatrix.cpp:36: warning: `int l12' might be used uninitialized in this function submatrix.cpp:36: warning: `int l22' might be used uninitialized in this function