Language: C++

#include <bits/stdc++.h>

using namespace std;

inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}
template<class T> inline T sqr(T x) {return x*x;}

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<string> vs;
typedef pair<int, int> pii;
typedef long long ll;

#define all(a)  (a).begin(),(a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define pb push_back
#define mp make_pair
#define each(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define exist(s,e) ((s).find(e)!=(s).end())
#define range(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n)  range(i,0,n)
#define clr(a,b) memset((a), (b) ,sizeof(a))
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;

typedef long double D;
const D eps = 1e-10;
const D pi  = acos(-1.0);
const ll INF =1LL << 62;
const int inf =1 << 29;

double dp[10010][21][21];
int x[20],y[20];

inline D dist(int i,int j){
	int dx=(x[i]-x[j]);
	int dy=(y[i]-y[j]);
	return sqrt(1.0*dx*dx+1.0*dy*dy);
}

int main(void){
	int n;
	cin >> n;
	D r,theta;
	cin >> r >> theta;
	int limit=1*r;

	rep(i,n) cin >> x[i] >> y[i];

	rep(i,limit+1)rep(j,n+1)rep(k,n+1) dp[i][j][k]=inf;
	dp[0][0][n]=0.0;

	rep(i,limit)rep(cp,n)rep(pp,n+1){
		if(dp[i][cp][pp]==inf) continue;
		if(i>0&&pp==n) continue;
		if(cp==pp) continue;
		rep(np,n){
			if(np==cp) continue;
			D add=dist(cp,np);
			int cx=x[cp]-x[pp],cy=y[cp]-y[pp];
			int nx=x[np]-x[cp],ny=y[np]-y[cp];
			D dot=1.0*cx*nx+1.0*cy*ny;
			dot/=(dist(cp,pp)*dist(np,cp));
			D angle=acos(dot);
			angle*=180.0/pi;

			if(angle>180.0) angle=360.0-angle;
			if(pp!=n&&angle>theta+eps) continue;
			if(dp[i][cp][pp]+add-r>eps) continue;
			dp[i+1][np][cp]=min(dp[i+1][np][cp],dp[i][cp][pp]+add);
		}
	}

	int ans=0;
	rep(i,limit+1)rep(cp,n)rep(pp,n){
		if(dp[i][cp][pp]<=r+eps) ans=max(ans,i);
	}
	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:71:44: error: no matching function for call to 'min(double&, D)'
   71 |                         dp[i+1][np][cp]=min(dp[i+1][np][cp],dp[i][cp][pp]+add);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:71:44: note:   deduced conflicting types for parameter 'const _Tp' ('double' and 'D' {aka 'long double'})
   71 |                         dp[i+1][np][cp]=min(dp[i+1][np][cp],dp[i][cp][pp]+add);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:71:44: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
   71 |                         dp[i+1][np][cp]=min(dp[i+1][np][cp],dp[i][cp][pp]+add);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~