0_0_1155376_1552.cpp: In function `int isok(int, int)':
0_0_1155376_1552.cpp:29: error: `abs' undeclared (first use this function)
0_0_1155376_1552.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1155376_1552.cpp: In function `void presolve(int)':
0_0_1155376_1552.cpp:44: error: `abs' undeclared (first use this function)
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