Submission #955005

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Source Code Expand

#include <bits/stdc++.h>

const int N = 200000 + 10;

int n, x;
int ans[N];

int main() {
  scanf("%d%d", &n, &x);
  if (x == 1 || x == 2 * n - 1) return puts("No"), 0;
  puts("Yes");
  ans[n] = x;
  static bool flag[N];
  flag[x] = true;
  if (x > 2) {
    ans[n - 1] = 1;
    ans[n + 1] = 2 * n - 1;
    ans[n + 2] = 2;
    flag[1] = flag[2] = flag[2 * n - 1] = true;
  } else {
    ans[n - 1] = 2 * n - 1;
    ans[n + 1] = 1;
    ans[n + 2] = 2 * n - 2;
    flag[1] = flag[2 * n - 2] = flag[2 * n - 1] = true;
  }
  for (int i = 1, j = 1; i < 2 * n; ++i) {
    if (!ans[i]) {
      while (flag[j]) ++j;
      ans[i] = j;
      flag[j] = true;
    }
  }
  for (int i = 1; i < 2 * n; ++i) printf("%d\n", ans[i]);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:9:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &n, &x);
                        ^

Judge Result