0_0_1831657_25616.cpp: In function `double dis(p, p)':
0_0_1831657_25616.cpp:14: error: `r' undeclared (first use this function)
0_0_1831657_25616.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1831657_25616.cpp:14: error: expected `;' at end of input
0_0_1831657_25616.cpp:14: error: expected `}' at end of input
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