0_0_4123394_3484.cpp: In function `int main()':
0_0_4123394_3484.cpp:49: error: `sx' undeclared (first use this function)
0_0_4123394_3484.cpp:49: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4123394_3484.cpp:50: error: `sy' undeclared (first use this function)
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