0_0_18273885_17790.cpp: In function 'int main()':
0_0_18273885_17790.cpp:70:17: error: 'M_PI' was not declared in this scope
ans = ans1 = M_PI/2.0;
^
0_0_18273885_17790.cpp:77:14: error: 'M_PI' was not declared in this scope
if (ans > M_PI) ans = 2*M_PI-ans, ans1 = ans-ang;
^
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