ABC129B - Balance

問題：B - Balance

#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

#define REP(i, n) for (int i = 0; i < (n); ++i)

int main(void) {
    const int INF = 1 << 30;
    int n, ans = INF, sum = 0, part_sum = 0;

    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n;
    vector<int> w(n);
    REP(i, n) {
        cin >> w[i];
        sum += w[i];
    }

    REP(i, n - 1) {
        part_sum += w[i];
        ans = min(ans, abs(part_sum - abs(sum - part_sum)));
    }

    cout << ans << "\n";
    return 0;
}