Codeforces Round #448 (Div. 2) A题. Pizza Separation

A. Pizza Separation

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Students Vasya and Petya are studying at the BSU (Byteland State University). At one of the breaks they decided to order a pizza. In this problem pizza is a circle of some radius. The pizza was delivered already cut into n pieces. The i-th piece is a sector of angle equal to a_i. Vasya and Petya want to divide all pieces of pizza into two continuous sectors in such way that the difference between angles of these sectors is minimal. Sector angle is sum of angles of all pieces in it. Pay attention, that one of sectors can be empty.

Input

The first line contains one integer n (1 ≤ n ≤ 360)  — the number of pieces into which the delivered pizza was cut.

The second line contains n integers a_i (1 ≤ a_i ≤ 360)  — the angles of the sectors into which the pizza was cut. The sum of all a_i is 360.

Output

Print one integer  — the minimal difference between angles of sectors that will go to Vasya and Petya.

Examples

Input

4
90 90 90 90

Output

0

Input

3
100 100 160

Output

40

Input

1
360

Output

360

Input

4
170 30 150 10

Output

0

Note

In first sample Vasya can take 1 and 2 pieces, Petya can take 3 and 4 pieces. Then the answer is |(90 + 90) - (90 + 90)| = 0.

In third sample there is only one piece of pizza that can be taken by only one from Vasya and Petya. So the answer is |360 - 0| = 360.

In fourth sample Vasya can take 1 and 4 pieces, then Petya will take 2 and 3 pieces. So the answer is |(170 + 10) - (30 + 150)| = 0.

Picture explaning fourth sample:

Both red and green sectors consist of two adjacent pieces of pizza. So Vasya can take green sector, then Petya will take red sector.

 题意：把一个披萨分成 n 分 ， 第 i 分 的圆心角 为 ai ，可以吧 披萨 分成 连续的两部分 ， 问这两部分的最小差的绝对值是多少

思路：直接暴力就好，或者假设差值 关于 180 对称 ， 然后枚举 n 个起点 ， 之后 求 相加之后 与 180 相比的最小值的两倍

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>

using namespace std ; 

#define maxn 400 
int num[maxn] ; 
int n ; 

int main(){
     
    //freopen("in" , "r" , stdin) ; 
    
    while(~scanf("%d" , &n)){

        for(int i=0 ; i<n ;i++){
            scanf("%d"  , &num[i]) ; 
        }
        int result = 500 , sum = 0; 
        for(int i=0 ; i<n ; i++){//枚举起点
            sum = num[i] ; 
            result = min(abs(180-sum) , result) ; 
            for(int j=i+1 ; j!= i&&j<n ; j = (j+1)%n){
                sum += num[j] ; 
                result = min(abs(180-sum) , result) ; 
            }
        }

        printf("%d\n" , 2*result) ; 
    }

    return 0 ; 
}

sum 和 360-sum 分别为两部分披萨的角度

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>

using namespace std ;

#define maxn 400
int num[maxn] ;
int n ;

int main(){

    //freopen("in" , "r" , stdin) ;

    while(~scanf("%d" , &n)){

        for(int i=0 ; i<n ;i++){
            scanf("%d"  , &num[i]) ;
        }
        int result = 500 , sum = 0;
        for(int i=0 ; i<n ; i++){//枚举起点
            sum = num[i] ;
            result = min(abs(360-sum - sum) , result) ;
            for(int j=i+1 ; j!= i&&j<n ; j = (j+1)%n){
                sum += num[j] ;
                result = min(abs(360-sum - sum) , result) ;
            }
        }

        printf("%d\n" , result) ;
    }

    return 0 ;
}