Submission #1044075

#TimeUsernameProblemLanguageResultExecution timeMemory
1044075UmairAhmadMirzaSvjetlost (COI18_svjetlost)C++17
0 / 100
2 ms348 KiB
#include <bits/stdc++.h> using namespace std; #define point pair<int,int> #define x first #define y second #define double long double #define int long long double const pi=3.141592653589793; double angle(point p1,point p2){ int deltaY = p2.y - p1.y; int deltaX = p2.x - p1.x; double dg = atan2(deltaY, deltaX) * 180 / pi; if(dg<0) dg+=360; return dg;} bool check(double a1,double a2){ if(a1<180) return (a2<a1) || (a2>a1+180); else return (a2>a1-180); } double dist(point a,point b){ return sqrt(((a.x-b.x)*(a.x-b.x))+((a.y-b.y)*(a.y-b.y))); } double solve(vector<point> pts){ int n=pts.size(); if(n==1) return 0; else if(n==2) return dist(pts[0],pts[1]); for (int i = 0; i < n; ++i) pts.push_back(pts[i]); deque<point> v; v.push_back(pts[0]); v.push_back(pts[1]); v.push_back(pts[2]); double len=dist(pts[0],pts[1])+dist(pts[1],pts[2]); double maxx=len; int p1=0,p2=2; while(p1<n){ int a1=angle(pts[p1],pts[p1+1]); int a2=angle(pts[p2+1],pts[p2]); if(a1!=a2 && check(a1,a2)){ len+=dist(pts[p2],pts[p2+1]); p2++; } else{ len-=dist(pts[p1],pts[p1+1]); p1++; } maxx=max(maxx,len); } return maxx; } signed main(){ int n; cin>>n; vector<point> pts(n); for (int i = 0; i < n; ++i) cin>>pts[i].x>>pts[i].y; if(angle(pts[0],pts[1])>angle(pts[0],pts[2])) reverse(pts.begin(), pts.end()); cout<<fixed; cout<<setprecision(7)<<solve(pts)<<endl; return 0; }
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