Submission #1000876
Source Code Expand
#include <stdio.h> const long long mod = 1000000007; long long inv[100100], fact[100100], ifact[100100]; int main() { inv[1] = fact[0] = fact[1] = ifact[0] = ifact[1] = 1; for (int i = 2; i < 100100; i++){ inv[i] = (mod - mod / i) * inv[mod % i] % mod; fact[i] = fact[i - 1] * i % mod; ifact[i] = ifact[i - 1] * inv[i] % mod; } int a, b, c; scanf("%*d %d %d %d", &a, &b, &c); long long ans = 0; if (b % 2 == 0){ b /= 2; for (int i = 0; i <= a && i <= c; i++){ for (int j = 0; i + 3 * j <= c; j++){ int g = a + b + j, l = c - i - 3 * j; long long hey = fact[g] * ifact[i] % mod * ifact[a-i] % mod * ifact[b] % mod * ifact[j] % mod; long long com = b ? fact[l + b - 1] * ifact[l] % mod * ifact[b - 1] % mod : (l == 0); ans = (ans + hey * com) % mod; } } } printf("%lld\n", ans); return 0; }
Submission Info
Submission Time | |
---|---|
Task | J - 123 Pairs |
User | august14 |
Language | C++14 (GCC 5.4.1) |
Score | 1500 |
Code Size | 873 Byte |
Status | AC |
Exec Time | 21 ms |
Memory | 2560 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:17:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%*d %d %d %d", &a, &b, &c); ^
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1500 / 1500 | ||||
Status |
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Set Name | Test Cases |
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Sample | example0.txt, example1.txt |
All | 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, 040.txt, 041.txt, 042.txt, 043.txt, 044.txt, 045.txt, 046.txt, 047.txt, 048.txt, 049.txt, example0.txt, example1.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
000.txt | AC | 13 ms | 2560 KB |
001.txt | AC | 6 ms | 2560 KB |
002.txt | AC | 6 ms | 2560 KB |
003.txt | AC | 6 ms | 2560 KB |
004.txt | AC | 6 ms | 2560 KB |
005.txt | AC | 6 ms | 2560 KB |
006.txt | AC | 6 ms | 2560 KB |
007.txt | AC | 6 ms | 2560 KB |
008.txt | AC | 6 ms | 2560 KB |
009.txt | AC | 6 ms | 2560 KB |
010.txt | AC | 6 ms | 2560 KB |
011.txt | AC | 6 ms | 2560 KB |
012.txt | AC | 6 ms | 2560 KB |
013.txt | AC | 6 ms | 2560 KB |
014.txt | AC | 6 ms | 2560 KB |
015.txt | AC | 18 ms | 2560 KB |
016.txt | AC | 7 ms | 2560 KB |
017.txt | AC | 10 ms | 2560 KB |
018.txt | AC | 7 ms | 2560 KB |
019.txt | AC | 10 ms | 2560 KB |
020.txt | AC | 8 ms | 2560 KB |
021.txt | AC | 16 ms | 2560 KB |
022.txt | AC | 7 ms | 2560 KB |
023.txt | AC | 8 ms | 2560 KB |
024.txt | AC | 17 ms | 2560 KB |
025.txt | AC | 8 ms | 2560 KB |
026.txt | AC | 12 ms | 2560 KB |
027.txt | AC | 16 ms | 2560 KB |
028.txt | AC | 10 ms | 2560 KB |
029.txt | AC | 11 ms | 2560 KB |
030.txt | AC | 16 ms | 2560 KB |
031.txt | AC | 17 ms | 2560 KB |
032.txt | AC | 7 ms | 2560 KB |
033.txt | AC | 6 ms | 2560 KB |
034.txt | AC | 10 ms | 2560 KB |
035.txt | AC | 11 ms | 2560 KB |
036.txt | AC | 7 ms | 2560 KB |
037.txt | AC | 6 ms | 2560 KB |
038.txt | AC | 21 ms | 2560 KB |
039.txt | AC | 6 ms | 2560 KB |
040.txt | AC | 6 ms | 2560 KB |
041.txt | AC | 9 ms | 2560 KB |
042.txt | AC | 6 ms | 2560 KB |
043.txt | AC | 6 ms | 2560 KB |
044.txt | AC | 6 ms | 2560 KB |
045.txt | AC | 6 ms | 2560 KB |
046.txt | AC | 6 ms | 2560 KB |
047.txt | AC | 6 ms | 2560 KB |
048.txt | AC | 6 ms | 2560 KB |
049.txt | AC | 6 ms | 2560 KB |
example0.txt | AC | 6 ms | 2560 KB |
example1.txt | AC | 7 ms | 2560 KB |