0_0_2046842_4114.cpp: In function `int modular_linear(int, int, int, int*)':
0_0_2046842_4114.cpp:6: error: `ext_gcd' undeclared (first use this function)
0_0_2046842_4114.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
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