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View Compilation Error

0_0_4891600_7561.cpp: In function `void inputa()':
0_0_4891600_7561.cpp:26: error: `qsort' undeclared (first use this function)
0_0_4891600_7561.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4891600_7561.cpp: In function `void inputb()':
0_0_4891600_7561.cpp:36: error: `qsort' undeclared (first use this function)
0_0_4891600_7561.cpp: In function `int main()':
0_0_4891600_7561.cpp:82: error: `Match' undeclared (first use this function)
0_0_4891600_7561.cpp:91: error: `fj' undeclared (first use this function)
0_0_4891600_7561.cpp: In function `int match()':
0_0_4891600_7561.cpp:112: error: `qsort' undeclared (first use this function)
0_0_4891600_7561.cpp: In function `int is_ao()':
0_0_4891600_7561.cpp:159: error: `fj' undeclared (first use this function)
0_0_4891600_7561.cpp: In function `int fj(Poi, Poi, Poi, Poi)':
0_0_4891600_7561.cpp:164: error: `int fj(Poi, Poi, Poi, Poi)' used prior to declaration
0_0_4891600_7561.cpp: In function `int Match()':
0_0_4891600_7561.cpp:227: error: `int Match()' used prior to declaration
0_0_4891600_7561.cpp:256: error: `qsort' undeclared (first use this function)


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