제출 #1203428

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1203428		Muaath_5	육각형 영역 (APIO21_hexagon)	C++20	3 / 100	1 ms	400 KiB

hexagon

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll MOD = 1000000007;
const ll DIV_6 = 686070594; // binpow(6, MOD-2);
int draw_territory(int N, int a, int b, vector<int> D, vector<int> L) {
  const ll A = a, B = b;
  
  const ll len = L[0]+1;
  const ll cnt = (len*(len+1)/2)%MOD;
  
  const ll sum_of_powers = len*(len+1)%MOD * (2*len+1)%MOD * DIV_6%MOD;
  assert(0 <= sum_of_powers && sum_of_powers < MOD);
  
  const ll first_part = (A*cnt)%MOD;
  
  const ll second_part = (B*((sum_of_powers - cnt+MOD)%MOD)%MOD)%MOD;
  assert(0 <= second_part && second_part < MOD);
  return (first_part + second_part)%MOD;
}

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