QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#183430 | #6744. Square | ucup-team004# | AC ✓ | 16ms | 3600kb | C++20 | 869b | 2023-09-19 15:05:49 | 2023-09-19 15:05:49 |
Judging History
answer
#include <bits/stdc++.h>
using i64 = long long;
i64 get(i64 n) {
i64 u = std::sqrt(2.0L * n);
while (u * (u + 1) / 2 < n) {
u++;
}
while (u * (u - 1) / 2 + 1 > n) {
u--;
}
return u;
}
void solve() {
i64 x, y;
std::cin >> x >> y;
if (x >= y) {
std::cout << x - y << "\n";
return;
}
i64 u = get(y);
i64 t = y - u * (u - 1) / 2 - 1;
i64 v = get(x);
i64 q = x - v * (v - 1) / 2 - 1;
i64 ans = u - v;
if (v - q <= u - t) {
ans += u - t - (v - q);
} else {
ans += u - t + q + 1;
}
std::cout << ans << "\n";
}
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int t;
std::cin >> t;
while (t--) {
solve();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3600kb
input:
2 5 1 1 5
output:
4 3
result:
ok 2 number(s): "4 3"
Test #2:
score: 0
Accepted
time: 16ms
memory: 3468kb
input:
100000 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 1 25 1 26 1 27 1 28 1 29 1 30 1 31 1 32 1 33 1 34 1 35 1 36 1 37 1 38 1 39 1 40 1 41 1 42 1 43 1 44 1 45 1 46 1 47 1 48 1 49 1 50 1 51 1 52 1 53 1 54 1 55 1 56 1 57 1 58 1 59 1 60 1 ...
output:
0 2 1 4 3 2 6 5 4 3 8 7 6 5 4 10 9 8 7 6 5 12 11 10 9 8 7 6 14 13 12 11 10 9 8 7 16 15 14 13 12 11 10 9 8 18 17 16 15 14 13 12 11 10 9 20 19 18 17 16 15 14 13 12 11 10 22 21 20 19 18 17 16 15 14 13 12 11 24 23 22 21 20 19 18 17 16 15 14 13 12 26 25 24 23 22 21 20 19 18 1 0 2 2 1 3 4 3 2 4 6 5 4 3 5 ...
result:
ok 100000 numbers