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  1. /**
  2. 	Template by Akikaze (秋風) - formerly proptit_4t41.
  3. 	Code written by a random fan of momocashew and Chiho.
  4.  
  5. 	H△G x Mili - November 27th, 2013
  6. 	Mag Mell (Mili) - Sep 17th, 2014
  7. 	H△G x Mili Vol.2 - May 9th, 2015
  8. 	Miracle Milk (Mili) - Oct 12th, 2016
  9. 	青色フィルム (H△G) - February 14th, 2018
  10. 	Millennium Mother (Mili) - April 25th, 2018
  11. **/
  12.  
  13. /** -----PRAGMA----- **/
  14. #pragma comment(linker, "/stack:200000000")
  15. #pragma GCC optimize("Ofast")
  16. #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
  17.  
  18. #include <bits/stdc++.h>
  19. using namespace std;
  20.  
  21. /** -----BASIC MACROES----- **/
  22. #define endl '\n'
  23. #define i64 long long
  24. #define ld long double
  25. #define pub push_back
  26. #define mp make_pair
  27. #define fi first
  28. #define se second
  29. const long long MOD = 1000000007LL, INF = 1e9, LINF = 1e18;
  30. const long double PI = 3.141592653589793116, EPS = 1e-9, GOLD = ((1+sqrt(5))/2);
  31. typedef vector<i64> vi;
  32. typedef vector<ld> vd;
  33. typedef vector<string> vs;
  34. typedef vector<bool> vb;
  35. typedef pair<i64, i64> pii;
  36. typedef pair<i64, pii> pip;
  37. typedef pair<pii, i64> ppi;
  38.  
  39. /** -----BIT CONTROLS----- **/
  40. template<class T> int getbit(T s, int i) { return (s >> 1) & 1; }
  41. template<class T> T onbit(T s, int i) { return s | (T(1) << i); }
  42. template<class T> T offbit(T s, int i) { return s & (~(T(1) << i)); }
  43. template<class T> int cntbit(T s) { return __builtin_popcount(s); }
  44.  
  45. /** -----IDEAS/ALGORITHMS-----
  46.  
  47.     -------------------------- **/
  48.  
  49. /** -----CUSTOM TYPEDEFS/DEFINES----- **/
  50.  
  51.  
  52. /** -----GLOBAL VARIABLES----- **/
  53. i64 N, ans = LINF; vi A;
  54.  
  55. /** -----EXTENSIVE FUNCTIONS----- **/
  56.  
  57.  
  58. /** -----COMPULSORY FUNCTIONS----- **/
  59. void VarInput() {
  60. 	ios_base::sync_with_stdio(0); cin.tie(NULL);
  61. 	cin >> N; A.resize(N);
  62. 	for (i64 i=0; i<N; i++) cin >> A[i];
  63. }
  64.  
  65. void ProSolve() {
  66. 	for (i64 z=0; z<N; z++) {
  67. 		//tracker1(z);
  68. 		vi B = A; i64 change = 0;
  69. 		for (i64 i=0; i<z; i++) {
  70. 			B[i] += change; change--;
  71. 		}
  72. 		for (i64 i=z; i<N; i++) {
  73. 			B[i] += change; change++;
  74. 		}
  75. 		sort(B.begin(), B.end());
  76. 		i64 B0 = max(max(B[N/2], -change), 0LL);
  77. 		//cout << "B0 = " << B0 << endl;
  78. 		i64 steps = 0;
  79. 		for (i64 i=0; i<z; i++) {
  80. 			steps += abs(B0 - A[i]);
  81. 			B0++;
  82. 		}
  83. 		for (i64 i=z; i<N; i++) {
  84. 			steps += abs(B0 - A[i]);
  85. 			B0--;
  86. 		}
  87. 		ans = min(ans, steps);
  88. 	}
  89. 	cout << ans;
  90. }
  91.  
  92. /** -----MAIN FUNCTION----- **/
  93. int main() {
  94. 			#ifdef Akikaze
  95. 			//freopen("FILE.INP", "r", stdin);
  96. 			//freopen("FILE.OUT", "w", stdout);
  97. 			#endif
  98. 	VarInput();
  99. 			#ifdef Akikaze
  100. 			auto TIME1 = chrono::steady_clock::now();
  101. 			#endif
  102. 	ProSolve();
  103. 			#ifdef Akikaze
  104. 			auto TIME2 = chrono::steady_clock::now();
  105. 			auto DIFF = TIME2 - TIME1;
  106. 			cout << "\n\nTime elapsed: " << chrono::duration<double>(DIFF).count() << " seconds.";
  107. 			#endif
  108. 	return 0;
  109. }
  110.  
  111. /**
  112. OOO###$-^`^^.--~~~-.~~~~~-.^~~~~__~:++;+;~^^^^-!%eiiio?O##?i==e####!iiiii:.^^
  113. ##OO##$-^`^^.-~~~~~..~~~~~.^~~~~__~:+;;;;~^``^-*!!**o*e$##!=++*O###e=====:.^^
  114. ##OOOO$-^```.~~~~~~..~~~~~.^~~~~-_~:+;;;;~```^-e!eee**e$##!+;;oO###*====+_^^^
  115. ###OOO$_^```^~~~~~~..~~~~~.^.~~~-_~:+;;;;.```^-?!ee***e$##e;;;oO###*+++++_^`^
  116. ######O_^```^~~~~~~.......^^...~--~:;::::.````~ee***ooe$##e;::iO##Oo+++++-^``
  117. ####O$%_^```^.^^^^^^^^^^^^^^^^^^....~~~~~.````~;;:::::;=ii+_-_;o***+:::::-^`^
  118. O$$O$%e-^```^^.~....^.....^^.....^^.^^^^^^````^......^....................^``
  119. i++iiee-^```^.-;__:_.-:__:~._:-__..-----.^````^~-~~-~.~-~~-..~~~~..~~~~~.^^``
  120. :::;;i=-^```^.-;_-;_._;__;-.:;_:;~~::_:_.^````^-:__;-._;_:;~~___;-.__-::.^^``
  121. +;;;=i;~^````^-_--_-.-_--:~._:-__.~__-__.^````^~_--:-.-_-::.~_--:-.__-__.^^``
  122. ii=io*+~^````^-:--:-.-:__:-.__-__.._--_-.^````^~_--_~.---__.~_--:~.__-__.^```
  123. ee*e!!o-^````^-:_-:_._;__;-._:-::.~:_-;_.`````^-;__:-._:-::.~;__;-._:_;:.^```
  124. ??????e_^````^~~~~-~.~-~~-~.--~--.._--_-.^````^~_--_~.-_-__.~:--:~.__-:_.^```
  125. %%%??%!;^````^^^^^^^^^^^^^^^^^^^^^^^^...^^````^......^.....^......^.....^^```
  126. %%%%?%%o~`````````````````````````````^``````^^``^^^^^^^``^^^^^^^^^^^^^^^^```
  127. $$$$%%$!:^``````````````````````````````````^^```````````````````````````````
  128. #OOOOO$%o~````````````````````````````^^^^^..^`^^^..^``````````````````^^^^^^
  129. #####OO$!_^``^^^^^`^...^^``````````._+++++-~-.^.^..-.^````````````````^..~--:
  130. O######O%:...-____-_::_-~~~~-~.~~~_=ioo*eo===;_~.~~--~^^^^^^^^^^^^^^^^~--__::
  131. OOOOO##!:~^^.;!!?????o;__++===o*i:;+ii*!**oooi==;:_--:_:+=iii====;:;;__:+;__:
  132. OO%%$O#e~^^^^:!!$OOO?e=:__;+::_*=ii===oo**e***o*ooi;_--:=?%!!!!eo;:+;__;++;:;
  133. #O%?%$OO+.^`^:?%%##$i;::::_____oe!!?e*==oo*e**ee!?**+-_:_=oe!ee?=;;+;;;++::+=
  134. ##OO$%$O%_..~+??!%O?+;______:_=!?!$$?%!eo*****?!$!?!e+;:_:;o*o*!i;:;;+=+:_:;+
  135. #OO$?!?%$eiio*ooi==+::_:__;::;!%$$O$$$$%!e***!!$!%O$!oi:_;;ooiio*+;==+i+;+=ii
  136. $$?e*o*e!!!*o=;::;:_-__:::-::o$OOOOO#OO$$%!!ee%?O#$!!o+;::+i=+++=;++;+=+=i==o
  137. %?!*i=ioooo=+;:_:+=:__-___-_:%O#OOO###OOO%%%$$$OO$?%%=-_::_::;::::;;::::++++*
  138. OO%?*+;=o!e*o=+;;==:__:__--_iOO#######O#OOO##OO$$%$O?+_.:__;;;--;=i=++===++o!
  139. #O!i+;;:;+;:;+==o=:--_::::__?###O############O$OO#OO*+:.~__;=;--e$eo!!o*oiii=
  140. O?*=;:;;:_~~-~-_;__--_;:_::;O###############OO###OO!=;_-~-__i+__!O*+;:+ii=i_.
  141. ??!*=+=;;_-~~~-_:;+;_;+:_;;*##############&######O?*+:__----____ie=;_;+=+::.^
  142. e$e!*oi;:__--_:;::;;::+;:;i%#############&&######$!i;:_____-:;__=;-_::_:_~-~^
  143. *O?!ooi+;:_~-_---_;;::=+_;oO#####&####&#&&&#####?o+;:____;:__:-:+_--::__-.^^^
  144. *#Oe++;;__:~_;__:;;;+:+i;;o##########&##&&&&&&#%=;;:__;+;=;_-~~_--__+;:::.^^`
  145. eO$o+;::_;=+i=++;:-__;io;:*#########&##&##&&&&#e;::::=*%!o=:--:__::;++;+=:~^^
  146. eO%=;+===*e?%*=;:__:;+o!+_?#####OO####&#O#&&&#$i:::+o*=oo=::__;:_-+=+:+;_:_.^
  147. e$%=+oe*o?$?oo;-~~_:;o*e*e$#####OO######OO###O!=:_:=?%%*i+;;_--:+;o**;o=_~..^
  148. e$%e**!*?%!;-_i+-~_++**oe?$O###OO####&&##%$#O%*;:___i?$o+:;_-~_oiii=eieo=;-^^
  149. !$%!e!ee!?i++_:;+;===o*o=$####OO##&&&&&%O??$%?o;__-~-==_:_;=:;++i++io!$!+:-^`
  150. !%?*o!!ii+_==::;i=;e!*e*?O######&&&&&#&%??!?%?i;:__-~-----;e=:+====*!*!%;~.~^
  151. e%?*ioi*!++*?oo=e*;ooieo?O###O#&&&&&&&&%!!e??e=;;;;:_--_~:;=__+;;:;e!*+!i.^~.
  152. e%?eoi+o***e!e%!$%ii****%O#####&&&&&&&&Oeeee!o+++;+=+_-:~:;_-::_;;;oi;_=i~^^^
  153. !?!!??*=ie?ooe?oo=_-:i*!O#####&&&&&&&&&##$e*o=;;++=++:;_:;i;+;+io+;ii;~_;;_:;
  154. !ee?$%i=o!i+=*!ei-_::;;?O####&&&&&&&&&&##$ei=+;;+++=+;oi*=;-i*=**++oi:~~_;;=o
  155. !?!%$?=o?%o*%e!%=_+==++?OO###&&&&&&&&&&#O$!i=+;;++==i+oe=:+:??oo*===+;-.~_+*!
  156. !%?%O!i?#O###$%$!e!*=+*$O###&&&&&&&&&&&#$$!o=++++==ii=;io+i*%!oooi==i::~~~_!%
  157. e??%$?=i%###Oo*%$!o*ee?$####&&&&&&&&&&&#$%?*i=====iooeoo==oeeooo+!?!oo=:___*$
  158. e?%%%?==!###?=e$!o=o%$$O###&&&&&&&&&&&&#$??eo====ioo!?*i+=oi=++o!eeoi=~:;;:+!
  159. e?%$$%o*$###O!%?eo*e$%$####&&&&&&&&&&&&O???e*i==iio*o*o+====*!+o$!oi=_^.-:===
  160. ?%$##O%%O####OO%?i*%$$O###&&&&&&&&&&&&#$!??!eoiiio**iiiio*ooe$*?#!eii;-~_+oi=
  161. %%$#&#OO#######O!!%?$O###&&&&&&&&&&&&&O?e!?!e*oio*ooi+++o!e!e$?$O?!+i****ee*o
  162. ??$###OOOOO####$!$$%$?###&&&&&&&&&&&&&%!*e?!e*iiioooi;:=ie?%%$O!%e*+o?%?*ooii
  163. e%O#&#O$OOO$O##O$OO$!?##&&#&&&&&&&&&&O?**e!!e?%oiiioo-_:+??$%%?=o!o+:+i+:_---
  164. ?$O###OOO#$?%O##O$OO$O##&#&&&&&&&&###%e*o*ee!%**%e:i=.:=*??%?!?eoei:-_:_~~~..
  165. O$$OO##O##$!e%OO$$OO$##&###&&##&####%!*oo*ee%%%%$?i*e=o;oe!%?ie!o*=:___----~~
  166. #$%?!?O#O%%!e!%$%!!$O##&##&&####O##%eoiio**??!%$#O%!!*ei;=;i?e??e*i=++;;;++::
  167. #Oe-.:$#$%?????!!o=?##&&#&&###O$##!i+==io**?%?$$O#%??!=i=+:-o%O%!o!%?!e!!?!ee
  168. O?-``:%$$%%%??%?!=i$O#&##&&#&O?$%=--_;+=o*?%??O%OOO?e?iioi!o*%O%?o?%%%$$$$$$$
  169. ?_``~o!???!!!!!ee*!OO#&##&##%??+.``^~_;+i*O$OOO$$OO%%?e*ie%%e%O?eo?e!$O$?!%$$
  170. :` .+e!!eeeeeee**!!O#&#&&&#$?+.     `._:+=o*$OOO%%$%$$?*;o%?*!?*=e$$$###$$OOO
  171. ^ ^::i!e*o****e**!!$##&&&#O?-^       ``~_:_*$OOOOOOOO?!!;ie!io!*i?O##########
  172. ``_o;=*ooooo*****ee$#&&&&#?.`         ``^~-_%$OO#OOOOe*$?*o!io!=i!%OOOOO$$%$$
  173. ~_i*+oooooooo**o*ee$##&&##-.           ```.~*$$$OOOOO?o?$!o*i*o+o!%%?%%%????%
  174. i;=i+iooooiioo**ee!$#&&&#e^             ``^^:$?$O$%OO$e!$?=+io==ee???????!!!?
  175. ?;_+=i=iooiioo**e!!O&&&&#:`              `^^^?OOO$?$OO%e?ei+i**oo*eeeee******
  176. ?*;;=iiiiiiioio**!!O&&&&?^ `       ```   ``^^:OO$O$OO$O$?i++io*==iooooooooooo
  177. ?*++=iiiiooioi**e!?O&&&&+```    ~=^-____~```^^*OOO##O$%$?o*!i=iiiiiiiiiiiii==
  178. ?o+=oiioooioo****!%#&&&O.`^`    -=_---_;+;^``^.%O####O$!!!?!i=i========++++++
  179. !i=ioooiooo**e!e!?%#&&&*`^``` ``    `    .:.```;O####OO?!??!==i==++++;;;;;;;;
  180. *=io*oooi*e!!???%$O#&&#-^.`````` ```..^^`` .^```e##OO$$%?!*o+===+;;:::::::___
  181. oooeeee**!!%%%?%$O##&&?^.^`````^  `~.^^^`^.`````.$OOOO$**?!ooi=+;::_____-----
  182. ee*eee!?%%%$$$%$OO#&&&+^.^`````^^`~~.^.^``.~^^```+OO#O$oe%*ioo++;::___:_-----
  183. e*o**e?%%$%$OOO$$O#&&#~^.^^^^``^.~-....^``.~.~````?##O$e?%*+ii++;;::::;::____
  184. eooo*%OOO#####OO$O#&&$^^.^^^``^^~-~....^^`^~~~^```_O#O$?%$$io=;;;;;;;;;;;;;::
  185. *oo*!O#######O$%$O#&&e^..^^^`^^^.~.....^^`^.~~~^```*#O$%%O#$e;:;;;;:::_::____
  186. *oe??%$%$%?%%%??%$##&i`..^^^^^^^.~.~...^``^.~~-.```.OO%%$O##!;_;+;:__-~--~~~~
  187. *i*e*eeee!!!!e!!%%#O#+^^.....^^^.~.~~..^``^^.~-~^```+%$%?$##!;_;+;;:_~~-_-~~~
  188. *ioe*ee*!!e!!e!!%$O?#+^^...~.^^^.~~~~.^```^^.~~-~```.%$?!$OO!;_;++;:_-~---~~~
  189. o=ie*e**!e*ee*e%$##?#+`^..~~^^^^.~~...^```^^^.~--^```!%!%%OO?+:;++;;:_-~--~~~
  190. o==**e*e!e*e?!oeO#O$&=``^.~~^^^.~~~...^` ``^^.~~~~```o%?%!?%?=::;;;;:-~~~~~~~
  191. *i=*!e*eeeeee?%%O$$##=^`^.~.^^..~~~..``````^^^~~~~^``=$?%%%$$?i;++++;-~--~~~~
  192. !oie!!e!!**eoo?%$####=_`^.~^....~~....~--_~.~....~~``~%*i!?!**i=====+:-::-~~~
  193. !*ie!**!!***ooe%%#&&&i:.^^.^^..^.~~~__--:;;..~..~~~.``ee=***=iooiii==+++:-~~~
  194. $?eeeoo!*ooi=i**io#&&e_~^^.^^..~::::__~-:::.-~-~+.~.^`iO$$$$???!!i=+++==;--~~
  195. $%??*o*eo+oooi*o;i$O&$--^^.^^._::__:____::_.~--~*~..^^+####OO?%%?+;::;;;:----
  196. !???!!!*oieo==*=;;+=e#:-.^^^.:___-_:__::__-~-.~~oi.^..;######$??e:______-----
  197. ??%?!e!eeee*ii*=;+=++*+_.^^.:__--------_-_.~-~--;?-..~+O######$%!:___--------
  198. !!??ee?!ee*oii+;++i+;+i:-.._:-_--_-__--_--^~~.~-.**..-iO##O####$?:_______----
  199. e!%?eee*o*o====+++=+;+i:;~.;_-_~~--------~^~-~.-.-!:~-*#OOO##O#$!+;;;:;;;:::_
  200. ee??!eiii*oi==*=+;==+=o=;:~+_:_.~--~~~~~~..~~~.-~.i*.-*OOO#O##OOo=ii======+++
  201. !**e!!oii*oi=o*+;;====oi;+-+::-~--~~~~~~~^.~~~.-~-~!:_eOO######Oe=iii=====+++
  202. ?!**ee*oo*ii=oo;:;==+=*o+;:=;;_~~~~~~~~~~^~~~~.-~_~o=_!#OO#####O$o======+++++
  203. ?*ii!eoooi===oi;;:+++=**o++=;;_.~~~~~....^.~~~.~~:_;o_?#OOOO###O%i+++++++++;;
  204. !iii!oiooi==ioi===iiio*oi=+o=;_~~~~~~...^.~~~~.~~:_-o_%OOOO###OO%i;;;;;;;;;;;
  205. !**e!ooo**iio*o+;+ii==iooo==o;:.~~~~~...^..~~~..~_:_=_$O#OOO##OO$e;;;::;;;:::
  206. e**e*i=ioii=o!*i++===+ioi*i=o+:~~~~~~...`..~~~..~:;;+:OO#OOOOO##O%+::::::::__
  207. ee*!oi=ioiii*!!o++==i=oooooi==;~~~~~~...^...~...-;;+;+$$O####O#OO$+::________
  208. *oe*=iiooi=i*e*i==oi=+=ioi=ii+;~~~~~...^^...~~..-;+*;*OOO#######$%=::________
  209. io!i+io**i=ie*i===ii==oe!ee?i=;-~~~....^^......._;e*;%OOO#####O#O$*;:;:______
  210. =ie*ii=ii==ie*=++;=i=i**ee!?!i=_~~~....^........:;O*i$##OOO#O#O##O$+:;::_____
  211. iiooii=i==io**=;;;====io*eeeeoi:-~~....^.....~..;=#!oOO##OOOO###O#Oi;;:__---_
  212. **/
  213.  
  214. // Tribute to a friend I owe countless. Thanks, TN.
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language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
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