提出 #29888817

---

ソースコード 拡げる

#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
bool s[100001];
int a[100001], ans[1000001];
struct Note
{
	int l, r, block_l, id;
}b[1000001];
int main()
{
	int n;
	scanf("%d", &n);
	for (int i = 1; i <= n; ++i)scanf("%d", &a[i]);
	int block_siz = sqrt(n), q;
	scanf("%d", &q);
	for (int i = 1; i <= q; ++i)
	{
		scanf("%d%d", &b[i].l, &b[i].r);
		b[i].block_l = (b[i].l - 1) / block_siz + 1;
		b[i].id = i;
	}
	sort(b + 1, b + (q + 1), [](const Note& a, const Note& b) {
		if (a.block_l != b.block_l)
		{
			return a.block_l < b.block_l;
		}
		if (a.block_l % 2)
		{
			return a.r < b.r;
		}
		return a.r > b.r;
		});
	int x = 0;
	for (int i = b[1].l; i <= b[1].r; ++i)
	{
		x += s[a[i]];
		s[a[i]] ^= 1;
	}
	ans[b[1].id] = x;
	for (int i = 2, l = b[1].l, r = b[1].r; i <= q; ++i)
	{
		for (; l > b[i].l; x += s[a[--l]], s[a[l]] ^= 1);
		for (; r < b[i].r; x += s[a[++r]], s[a[r]] ^= 1);
		for (; l < b[i].l; x -= !s[a[l]], s[a[l++]] ^= 1);
		for (; r > b[i].r; x -= !s[a[r]], s[a[r--]] ^= 1);
		ans[b[i].id] = x;
	}
	for (int i = 1; i <= q; ++i)
	{
		printf("%d\n", ans[i]);
	}
	return 0;
}

提出情報

コンパイルエラー

./Main.cpp: In function ‘int main()’:
./Main.cpp:14:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   14 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
./Main.cpp:15:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   15 |  for (int i = 1; i <= n; ++i)scanf("%d", &a[i]);
      |                              ~~~~~^~~~~~~~~~~~~
./Main.cpp:17:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   17 |  scanf("%d", &q);
      |  ~~~~~^~~~~~~~~~
./Main.cpp:20:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   20 |   scanf("%d%d", &b[i].l, &b[i].r);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

ジャッジ結果