0_0_1704238_32417.cpp: In function `void change(int, int)':
0_0_1704238_32417.cpp:15: error: `all' undeclared (first use this function)
0_0_1704238_32417.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1704238_32417.cpp: In function `bool gauss()':
0_0_1704238_32417.cpp:26: error: `all' undeclared (first use this function)
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