0_0_8521696_3954.cpp: In function `mat mul(mat, mat)': 0_0_8521696_3954.cpp:31: error: stray '\163' in program 0_0_8521696_3954.cpp:31: error: stray '\172' in program 0_0_8521696_3954.cpp:31: error: expected `;' before "while"