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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#504991 | #7178. Bishops | Esouling | TL | 0ms | 3616kb | C++20 | 1.3kb | 2024-08-04 18:06:37 | 2024-08-04 18:06:37 |
Judging History
answer
#include <bits/stdc++.h>
using loint = long long;
using db = double;
void solve() {
int n, m;
std::cin >> n >> m;
int inv = 0;
if (n > m) {
std::swap(n, m);
inv = 1;
}
std::vector<std::pair<int, int>> ans;
std::set<int> st1, st2;
int l = 1, r = m;
int cur = 1;
while (l <= r) {
if (cur & 1) {
for (int i = 1; i <= n; i ++) {
if (st1.count(i + l) == 0 && st2.count(i - l) == 0) {
st1.insert(i + l);
st2.insert(i - l);
ans.push_back({i, l});
}
}
l ++;
} else {
for (int i = 1; i <= n; i ++) {
if (st1.count(i + r) == 0 && st2.count(i - r) == 0) {
st1.insert(i + r);
st2.insert(i - r);
ans.push_back({i, r});
}
}
r --;
}
cur ^= 1;
}
std::cout << ans.size() << '\n';
for (auto &[x, y] : ans) {
if (inv) std::swap(x, y);
std::cout << x << ' ' << y << '\n';
}
}
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(0);
std::cout.tie(0);
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3520kb
input:
2 5
output:
6 1 1 2 1 1 5 2 5 1 3 2 3
result:
ok n: 2, m: 5, bishops: 6
Test #2:
score: 0
Accepted
time: 0ms
memory: 3616kb
input:
5 5
output:
8 1 1 2 1 3 1 4 1 5 1 2 5 3 5 4 5
result:
ok n: 5, m: 5, bishops: 8
Test #3:
score: -100
Time Limit Exceeded
input:
100000 100000