結果

問題 No.1120 Strange Teacher
ユーザー sak
提出日時 2020-10-12 01:03:44
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 1,432 bytes
コンパイル時間 2,142 ms
コンパイル使用メモリ 197,680 KB
最終ジャッジ日時 2025-01-15 06:46:06
ジャッジサーバーID
（参考情報） 		judge4 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1 WA * 2
other AC * 16 WA * 11
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ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> p_ll;
template<class T>
void debug(T itr1, T itr2) { auto now = itr1; while(now<itr2) { cout << *now << " "; now++; } cout << endl; }
#define repr(i,from,to) for (ll i=(ll)from; i<(ll)to; i++)
#define all(vec) vec.begin(), vec.end()
#define rep(i,N) repr(i,0,N)
#define per(i,N) for (int i=(int)N-1; i>=0; i--)
const ll MOD = pow(10,9)+7;
const ll LLINF = pow(2,61)-1;
const int INF = pow(2,30)-1;
vector<ll> fac;
void c_fac(int x=pow(10,6)+10) { fac.resize(x,true); rep(i,x) fac[i] = i ? (fac[i-1]*i)%MOD : 1; }
ll inv(ll a, ll m=MOD) { ll b = m, x = 1, y = 0; while (b!=0) { int d = a/b; a -= b*d; swap(a,b); x -= y*d; swap(x,y); } return (x+m)%m; }
ll nck(ll n, ll k) { return fac[n]*inv(fac[k]*fac[n-k]%MOD)%MOD; }
ll gcd(ll a, ll b) { if (a<b) swap(a,b); return b==0 ? a : gcd(b, a%b); }
ll lcm(ll a, ll b) { return a/gcd(a,b)*b; }
int main() {
  ll N; cin >> N;
  ll A[N]; rep(i,N) cin >> A[i];
  ll B[N]; rep(i,N) cin >> B[i];
  ll diff = 0; rep(i,N) diff += A[i] - B[i];
  if (N==2) {
    ll result = diff==0 ? abs(A[0]-B[0]) : -1;
    cout << result << endl;
  }
  else {
    diff /= N-2;
    ll C[N]; rep(i,N) C[i] = B[i] - (A[i]-diff);
    ll sum = 0; rep(i,N) sum += C[i];
    ll result = diff>=0&&diff==sum ? diff : -1;
    rep(i,N) if(C[i]<0) result = -1;
    // debug(C,C+N);
    cout << result << endl;
  }
  return 0;
}
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