Submission #1113248

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Source Code Expand

//Giorgi Kldiashvili

#include <bits/stdc++.h>

#define M 1000000007ll
#define ll long long
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#define MAX(x, y) ((x) < (y) ? (y) : (x))

using namespace std;

const int N = 300020;

int n;
ll answer, A, B, a[N], S[N][2][2];

int main()
{
  scanf("%d %lld %lld", &n, &A, &B);
  if(A > B) swap(A, B);
  for(int i = 1; i <= n; ++ i)
    scanf("%lld", &a[i]);
  a[0] = -1e18;
  S[1][0][0] = S[1][1][0] = 1;
  for(int i = 2; i <= n; ++ i)
  {
    if(a[i] - A < a[i - 2])
      return printf("0"), 0;
    if(a[i] - A >= a[i - 1])
      S[i][0][0] = (S[i - 1][0][0] + S[i - 1][0][1]) % M;
    if(a[i] - B >= a[i - 1])
      S[i][1][1] = (S[i - 1][1][1] + S[i - 1][1][0]) % M;
    S[i][1][0] = S[i - 1][0][0];
    if(a[i] - B >= a[i - 2])
      S[i][1][0] = (S[i - 1][0][1] + S[i][1][0]) % M;
    S[i][0][1] = (S[i - 1][1][0] + S[i - 1][1][1]);
  }

  for(int i = 0; i < 2; ++ i)
    for(int j = 0; j < 2; ++ j)
      answer = (answer + S[n][i][j]) % M;

  cout << answer << endl;

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:19:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %lld %lld", &n, &A, &B);
                                    ^
./Main.cpp:22:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &a[i]);
                         ^

Judge Result