src/geometry/PolygonCenter.h

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• Last update: 2025-07-19 20:33:24+09:00

Depends on

• src/geometry/Point.h

Code

/**
 * Author: Ulf Lundstrom
 * Date: 2009-04-08
 * License: CC0
 * Source:
 * Description: Returns the center of mass for a polygon.
 * Time: O(n)
 * Status: Tested
 */
#pragma once

#include "src/geometry/Point.h"

typedef Point<double> P;
P polygonCenter(const vector<P>& v) {
	P res(0, 0); double A = 0;
	for (int i = 0, j = sz(v) - 1; i < sz(v); j = i++) {
		res = res + (v[i] + v[j]) * v[j].cross(v[i]);
		A += v[j].cross(v[i]);
	}
	return res / A / 3;
}

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.14.0/x64/lib/python3.14/site-packages/onlinejudge_verify/documentation/build.py", line 71, in _render_source_code_stat
    bundled_code = language.bundle(stat.path, basedir=basedir, options={'include_paths': [basedir]}).decode()
                   ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.14.0/x64/lib/python3.14/site-packages/onlinejudge_verify/languages/cplusplus.py", line 187, in bundle
    bundler.update(path)
    ~~~~~~~~~~~~~~^^^^^^
  File "/opt/hostedtoolcache/Python/3.14.0/x64/lib/python3.14/site-packages/onlinejudge_verify/languages/cplusplus_bundle.py", line 312, in update
    raise BundleErrorAt(path, i + 1, "#pragma once found in a non-first line")
onlinejudge_verify.languages.cplusplus_bundle.BundleErrorAt: src/geometry/PolygonCenter.h: line 10: #pragma once found in a non-first line

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