0_0_20943660_21488.cpp: In function 'std::vector<Point> ConvexHull(std::vector<Point>&)':
0_0_20943660_21488.cpp:62:28: error: 'sort' was not declared in this scope
sort(p.begin(), p.end());
^
0_0_20943660_21488.cpp:63:38: error: 'unique' was not declared in this scope
p.erase(unique(p.begin(), p.end()), p.end());
^
0_0_20943660_21488.cpp: In function 'int main(int, const char**)':
0_0_20943660_21488.cpp:121:19: error: 'sort' was not declared in this scope
sort(l,l+n);
^
0_0_20943660_21488.cpp:148:57: error: 'upper_bound' was not declared in this scope
int id=upper_bound(l,l+n,Line(o,o+v))-l;
^
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