제출 #1217278

#제출 시각아이디문제언어결과실행 시간메모리
1217278Adeeb_obedoSeesaw (JOI22_seesaw)C++20
0 / 100
4 ms324 KiB
#include<bits/stdc++.h> #define int long long #define ld double #define _1 first #define _2 second #define yes cout<<"Yes\n" #define nah cout<<"No\n" #define FFF ios_base::sync_with_stdio(0);cin.tie(0); #define ipr pair<int,int> #define ret return #define intt int32_t #define mid ((l+r)/2) #define pb push_back #define lll __int128 using namespace std; int tst, ts; intt mo = 998244353, dx[] = {0, 1, 0, -1}, dy[] = {-1, 0, 1, 0}; int mul( int x, int y ) { ret ( ( x % mo ) * ( y % mo ) ) % mo; ret x*y; } int pwo( int x, int y ) { int res = 1; for( int i = 63; i + 1; i-- ) res = mul( res, res * ( ( 1ll << i )&y ? x : 1 ) ); ret res; } int dvii( int x, int y ) { ret mul( x, pwo( y, mo - 2 ) ); } int oo( char x ) { ret ( int )x - '0'; } int lgg( int x, int y ) { int u = 0; while( x ) { u++; x /= y; } ret u; } int mun( int x, int y ) { while( x < y )x += mo; ret ( x - y ) % mo; } int add( int x, int y ) { ret x + y - ( mo * ( x + y >= mo ) ); ret x + y; } int lcm( int x, int y ) { ret ( x * y ) / __gcd( x, y ); } #define endl '\n'; const int M =2007, N = 2e5+ 7, N2 = 5e3 + 7, inf = 2e18+7 ; double n,a[N],s,k; struct ooo{ double an,mx,mn; int o; }dp[M][M]; void sol(int l, int r,double su){ if(0) ret; if(l==r){ dp[l][r].mx=max(s,a[l]),dp[l][r].mn=min(s,a[l]); dp[l][r].an=dp[l][r].mx-dp[l][r].mn; ret; } sol(l+1,r,su-a[l]),sol(l,r-1,su-a[r]); ooo u,p; su/=(r-l+1); u.mn=min(su,dp[l+1][r].mn); u.mx=max(su,dp[l+1][r].mx); u.an=u.mx-u.mn; p.mn=min(su,dp[l][r-1].mn); p.mx=max(su,dp[l][r-1].mx); p.an=p.mx-p.mn; if(p.an<u.an) dp[l][r]=p; else dp[l][r]=u; dp[l][r].o=1; } void solve(){ cin>>n; double p=0; s=0; for(int i=0;i<n;i++){ cin>>a[i]; s+=a[i]; } p=s;s/=n; sol(0,n-1,p); cout<<fixed<<setprecision(10); cout<<dp[0][(int )n-1].an+0.0000000001<<endl; } intt main() { FFF //freopen("fcolor.in", "r", stdin); //freopen("fcolor.out", "w", stdout); tst = 1; //cin >> tst; for ( ts = 1; ts <= tst; ts++ ){ solve(); } }
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