0_0_4568029_1416.cpp: In function `int main()':
0_0_4568029_1416.cpp:16: error: `sx' undeclared (first use this function)
0_0_4568029_1416.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4568029_1416.cpp:16: error: `sy' undeclared (first use this function)
0_0_4568029_1416.cpp:16: error: `px' undeclared (first use this function)
0_0_4568029_1416.cpp:16: error: `py' undeclared (first use this function)
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