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QOJ
| ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
|---|---|---|---|---|---|---|---|---|---|
| #311501 | #5532. Kangaroo | james1BadCreeper | 100 ✓ | 7ms | 19196kb | C++14 | 543b | 2024-01-22 14:28:02 | 2024-01-22 14:28:02 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int P = 1000000007;
int n, s, t;
int f[2005][2005];
int main(void) {
scanf("%d%d%d", &n, &s, &t); f[1][1] = 1;
for (int i = 2; i <= n; ++i)
if (i != s && i != t) {
for (int j = 1; j <= i; ++j) {
int c = (i > s) + (i > t);
f[i][j] = (1ll * j * f[i - 1][j + 1] + 1ll * (j - c) * f[i - 1][j - 1]) % P;
}
} else {
for (int j = 1; j <= i; ++j)
f[i][j] = (f[i - 1][j - 1] + f[i - 1][j]) % P;;
}
printf("%d\n", f[n][1]);
return 0;
}
详细
Subtask #1:
score: 6
Accepted
Test #1:
score: 6
Accepted
time: 1ms
memory: 3884kb
input:
7 3 6
output:
14
result:
ok 1 number(s): "14"
Subtask #2:
score: 30
Accepted
Dependency #1:
100%
Accepted
Test #2:
score: 30
Accepted
time: 1ms
memory: 4080kb
input:
39 36 32
output:
964903316
result:
ok 1 number(s): "964903316"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3880kb
input:
26 1 26
output:
955348527
result:
ok 1 number(s): "955348527"
Test #4:
score: 0
Accepted
time: 0ms
memory: 4088kb
input:
40 11 33
output:
695661890
result:
ok 1 number(s): "695661890"
Test #5:
score: 0
Accepted
time: 0ms
memory: 4020kb
input:
39 39 38
output:
717149364
result:
ok 1 number(s): "717149364"
Test #6:
score: 0
Accepted
time: 0ms
memory: 4016kb
input:
40 10 25
output:
912929610
result:
ok 1 number(s): "912929610"
Test #7:
score: 0
Accepted
time: 0ms
memory: 4004kb
input:
37 25 23
output:
250748685
result:
ok 1 number(s): "250748685"
Test #8:
score: 0
Accepted
time: 0ms
memory: 4024kb
input:
39 2 38
output:
624060592
result:
ok 1 number(s): "624060592"
Test #9:
score: 0
Accepted
time: 1ms
memory: 4016kb
input:
40 18 22
output:
739993796
result:
ok 1 number(s): "739993796"
Test #10:
score: 0
Accepted
time: 1ms
memory: 4020kb
input:
40 11 35
output:
135213497
result:
ok 1 number(s): "135213497"
Subtask #3:
score: 15
Accepted
Dependency #1:
100%
Accepted
Dependency #2:
100%
Accepted
Test #11:
score: 15
Accepted
time: 1ms
memory: 4704kb
input:
199 100 70
output:
914653136
result:
ok 1 number(s): "914653136"
Test #12:
score: 0
Accepted
time: 1ms
memory: 4664kb
input:
187 3 40
output:
928785584
result:
ok 1 number(s): "928785584"
Test #13:
score: 0
Accepted
time: 1ms
memory: 4744kb
input:
199 198 197
output:
38412688
result:
ok 1 number(s): "38412688"
Test #14:
score: 0
Accepted
time: 1ms
memory: 6100kb
input:
200 40 140
output:
367088143
result:
ok 1 number(s): "367088143"
Test #15:
score: 0
Accepted
time: 0ms
memory: 6264kb
input:
199 111 3
output:
870834793
result:
ok 1 number(s): "870834793"
Test #16:
score: 0
Accepted
time: 1ms
memory: 6260kb
input:
200 133 73
output:
343127012
result:
ok 1 number(s): "343127012"
Test #17:
score: 0
Accepted
time: 1ms
memory: 6692kb
input:
178 15 163
output:
160852284
result:
ok 1 number(s): "160852284"
Test #18:
score: 0
Accepted
time: 1ms
memory: 5896kb
input:
197 43 79
output:
332057544
result:
ok 1 number(s): "332057544"
Test #19:
score: 0
Accepted
time: 1ms
memory: 6652kb
input:
200 33 79
output:
742545318
result:
ok 1 number(s): "742545318"
Subtask #4:
score: 49
Accepted
Dependency #1:
100%
Accepted
Dependency #2:
100%
Accepted
Dependency #3:
100%
Accepted
Test #20:
score: 49
Accepted
time: 2ms
memory: 8940kb
input:
658 169 438
output:
206087110
result:
ok 1 number(s): "206087110"
Test #21:
score: 0
Accepted
time: 2ms
memory: 10216kb
input:
700 207 509
output:
478311263
result:
ok 1 number(s): "478311263"
Test #22:
score: 0
Accepted
time: 3ms
memory: 10556kb
input:
755 139 507
output:
103783948
result:
ok 1 number(s): "103783948"
Test #23:
score: 0
Accepted
time: 7ms
memory: 19044kb
input:
2000 500 1500
output:
123410309
result:
ok 1 number(s): "123410309"
Test #24:
score: 0
Accepted
time: 0ms
memory: 18760kb
input:
2000 1000 1001
output:
956197482
result:
ok 1 number(s): "956197482"
Test #25:
score: 0
Accepted
time: 6ms
memory: 19196kb
input:
2000 666 1333
output:
993781645
result:
ok 1 number(s): "993781645"
Test #26:
score: 0
Accepted
time: 3ms
memory: 19148kb
input:
1991 198 677
output:
155058730
result:
ok 1 number(s): "155058730"
Test #27:
score: 0
Accepted
time: 0ms
memory: 14868kb
input:
1498 299 659
output:
665757882
result:
ok 1 number(s): "665757882"