Submission #8109887

Source Code Expand

#include<bits/stdc++.h>
#define fo(i, x, y) for(int i = x, B = y; i <= B; i ++)
#define ff(i, x, y) for(int i = x, B = y; i <  B; i ++)
#define fd(i, x, y) for(int i = x, B = y; i >= B; i --)
#define ll long long
#define pp printf
#define hh pp("\n")
using namespace std;  

const int mo = 1e9 + 7;

ll ksm(ll x, ll y) {
	ll s = 1;
	for(; y; y /= 2, x = x * x % mo)
		if(y & 1) s = s * x % mo;
	return s;
}

int n;

int main() {
	scanf("%d", &n);
	ll ans = 0;
	fo(i, 1, n) ans = (ans + ksm(ksm(3, i) * (n - i + 1) % mo, mo - 2)) % mo;
	ans = ans * ksm(n, mo - 2) % mo;
	pp("%lld\n", ans);
}

Submission Info

Submission Time
Task F - One Third
User cold_chair
Language C++14 (GCC 5.4.1)
Score 1800
Code Size 618 Byte
Status AC
Exec Time 261 ms
Memory 256 KiB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 1800 / 1800
Status
AC × 4
AC × 39
Set Name Test Cases
Sample example0.txt, example1.txt, example2.txt, example3.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, example0.txt, example1.txt, example2.txt, example3.txt
Case Name Status Exec Time Memory
000.txt AC 1 ms 256 KiB
001.txt AC 1 ms 256 KiB
002.txt AC 1 ms 256 KiB
003.txt AC 1 ms 256 KiB
004.txt AC 1 ms 256 KiB
005.txt AC 1 ms 256 KiB
006.txt AC 261 ms 256 KiB
007.txt AC 261 ms 256 KiB
008.txt AC 261 ms 256 KiB
009.txt AC 261 ms 256 KiB
010.txt AC 261 ms 256 KiB
011.txt AC 261 ms 256 KiB
012.txt AC 261 ms 256 KiB
013.txt AC 261 ms 256 KiB
014.txt AC 261 ms 256 KiB
015.txt AC 261 ms 256 KiB
016.txt AC 251 ms 256 KiB
017.txt AC 238 ms 256 KiB
018.txt AC 246 ms 256 KiB
019.txt AC 256 ms 256 KiB
020.txt AC 248 ms 256 KiB
021.txt AC 1 ms 256 KiB
022.txt AC 1 ms 256 KiB
023.txt AC 1 ms 256 KiB
024.txt AC 1 ms 256 KiB
025.txt AC 1 ms 256 KiB
026.txt AC 1 ms 256 KiB
027.txt AC 1 ms 256 KiB
028.txt AC 2 ms 256 KiB
029.txt AC 3 ms 256 KiB
030.txt AC 4 ms 256 KiB
031.txt AC 7 ms 256 KiB
032.txt AC 13 ms 256 KiB
033.txt AC 33 ms 256 KiB
034.txt AC 49 ms 256 KiB
example0.txt AC 1 ms 256 KiB
example1.txt AC 1 ms 256 KiB
example2.txt AC 1 ms 256 KiB
example3.txt AC 261 ms 256 KiB