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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#183430#6744. Squareucup-team004#AC ✓16ms3600kbC++20869b2023-09-19 15:05:492023-09-19 15:05:49

Judging History

你现在查看的是最新测评结果

  • [2023-09-19 15:05:49]
  • 评测
  • 测评结果:AC
  • 用时:16ms
  • 内存:3600kb
  • [2023-09-19 15:05:49]
  • 提交

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