#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);
int 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);
c[i][pre]--;
update(b, co[b] ? -1 : 1, cs);
co[b] ^= 1;
int now = query(ri, cs) - query(le - 1, cs);
c[i][now % (1 << i)]++;
int 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);
r[i][pre]--;
update(b, ro[b] ? -1 : 1, rs);
ro[b] ^= 1;
int now = query(ri, rs) - query(le - 1, rs);
r[i][now % (1 << i)]++;
int 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("%d\n", cnt * 4 + 1);
}
return 0;
}
Compilation message
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);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
7 ms |
736 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
5077 ms |
40332 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
