Submission #43196

#	Time	Username	Problem	Language	Result	Execution time	Memory
43196		baactree	즐거운 사진 수집 (JOI13_collecting)	C++14	30 / 100	5012 ms	48428 KiB

collecting

#include <bits/stdc++.h>
using namespace std;
int n, q;
int r[21], c[21];
int rs[1 << 21], cs[1 << 21];
int ro[1 << 20], co[1 << 20];
int sz = 1 << 20;
int pre[21];
void update(int idx, int val, int *tree) {
	idx += sz;
	while (idx) {
		tree[idx] += val;
		idx /= 2;
	}
}
int query(int le, int ri, int *tree) {
	int ret = 0;
	le += sz;
	ri += sz;
	while (le <= ri) {
		if (le & 1)ret += tree[le++];
		if (!(ri & 1))ret += tree[ri--];
		le /= 2;
		ri /= 2;
	}
	return ret;
}
int main() {
	scanf("%d%d", &n, &q);
	long long cnt = 0;
	for (int i = 1; i <= n; i++)
		r[i] = c[i] = 1 << (n - i);
	while (q--) {
		int a, b;
		scanf("%d%d", &a, &b);
		b--;
		if (a) {
			//col
			for (int i = 1, d = 2; i <= n; i++, d <<= 1) {
				pre[i] = query(b / d*d, (b / d + 1)*d - 1,cs) % d;
				if(pre[i]==0)c[i]--;
			}
			update(b, co[b] ? -1 : 1, cs);
			co[b] ^= 1;
			for (int i = 1, d = 2; i <= n; i++,d<<=1) {
				int now = query(b / d*d, (b / d + 1)*d - 1, cs) % d;
				if (now == 0)c[i]++;
				long long k = 0;
				if (pre[i] == 0)k = 1;
				else if (now == 0)k = -1;
				cnt += r[i] * k;
			}
		}
		else {
			//row
			for (int i = 1, d = 2; i <= n; i++, d <<= 1) {
				pre[i] = query(b / d*d, (b / d + 1)*d - 1, rs) % d;
				if(pre[i]==0)r[i]--;
			}
			update(b, ro[b] ? -1 : 1, rs);
			ro[b] ^= 1;
			for (int i = 1, d = 2; i <= n; i++, d <<= 1) {
				int now = query(b / d*d, (b / d + 1)*d - 1, rs) % d;
				if(now==0)r[i]++;
				long long k = 0;
				if (pre[i] == 0)k = 1;
				else if (now == 0)k = -1;
				cnt += c[i] * k;
			}
		}
		printf("%lld\n", cnt * 4 + 1);
	}
	return 0;
}

Compilation message (stderr)

collecting.cpp: In function 'int main()':
collecting.cpp:29:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &q);
                       ^
collecting.cpp:35:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
                        ^

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 70