제출 #43193

#제출 시각아이디문제언어결과실행 시간메모리
43193baactree즐거운 사진 수집 (JOI13_collecting)C++14
30 / 100
5010 ms42412 KiB
#include <bits/stdc++.h>
using namespace std;
int n, q;
int r[21][1 << 20], c[21][1 << 20];
int rs[1 << 21], cs[1 << 21];
int ro[1 << 20], co[1 << 20];
void update(int idx, int val, int *tree) {
	idx += 2;
	while (idx < 1 << 21) {
		tree[idx] += val;
		idx += idx&(-idx);
	}
}
int query(int idx, int *tree) {
	int ret = 0;
	idx += 2;
	while (idx) {
		ret += tree[idx];
		idx -= idx&(-idx);
	}
	return ret;
}
int main() {
	scanf("%d%d", &n, &q);
	long long cnt = 0;
	for (int i = 1; i <= n; i++)
		r[i][0] = c[i][0] = 1 << (n - i);
	while (q--) {
		int a, b;
		scanf("%d%d", &a, &b);
		b--;
		if (a) {
			//col

			for (int i = 1; i <= n; i++) {
				int d = 1 << i;
				int idx = b / d;
				int le = idx*d;
				int ri = (idx + 1)*d - 1;
				int pre = (query(ri, cs) - query(le - 1, cs))%d;
				c[i][pre]--;
				update(b, co[b] ? -1 : 1, cs);
				co[b] ^= 1;
				int now = (query(ri, cs) - query(le - 1, cs))%d;
				c[i][now]++;
				long long k = 0;
				if (pre == 0)k = 1;
				else if (now == 0)k = -1;
				cnt += r[i][0] * k;
				update(b, co[b] ? -1 : 1, cs);
				co[b] ^= 1;
			}
			update(b, co[b] ? -1 : 1, cs);
			co[b] ^= 1;
		}
		else {
			//row
			for (int i = 1; i <= n; i++) {
				int d = 1 << i;
				int idx = b / d;
				int le = idx*d;
				int ri = (idx + 1)*d - 1;
				int pre = (query(ri, rs) - query(le - 1, rs))%d;
				r[i][pre]--;
				update(b, ro[b] ? -1 : 1, rs);
				ro[b] ^= 1;
				int now = (query(ri, rs) - query(le - 1, rs))%d;
				r[i][now]++;
				long long k = 0;
				if (pre == 0)k = 1;
				else if (now == 0)k = -1;
				cnt += c[i][0] * k;
				update(b, ro[b] ? -1 : 1, rs);
				ro[b] ^= 1;
			}
			update(b, ro[b] ? -1 : 1, rs);
			ro[b] ^= 1;
		}
		printf("%lld\n", cnt * 4 + 1);
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

collecting.cpp: In function 'int main()':
collecting.cpp:24:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &q);
                       ^
collecting.cpp:30:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
                        ^
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