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Submission #774642

# Submission time Handle Problem Language Result Execution time Memory
774642 2023-07-06T01:13:46 Z Ozy Kućice (COCI21_kucice) C++17
10 / 110
 1 ms 340 KB 
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define debug(a) cout << #a << " = " << a << endl
#define debugsl(a) cout << #a << " = " << a << ", "
#define rep(i,a,b) for(lli i = (a); i <= (b); i++)
#define repa(i,a,b) for(lli i = (a); i >= (b); i--)
#define pll pair<lli,lli>

#define mod 1000000007

lli a,b,n,res,act;

lli expo(lli num, lli pot) {

    lli res = 1;
    while (pot) {
        if (pot&1) {
            res *= num;
            res %= mod;
        }
        num *= num;
        num %=mod;
        pot /= 2;
    }
    return res;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n;
    rep(i,1,n) cin >> a >> b;

    act = 1;
    res = 0;
    rep(i,0,n) {
        res += act*i;
        res %= mod;

        act *= (n-i);
        act %= mod;

        act *= expo(i+1,mod-2);
        act %= mod;


        //debugsl(act);
        //debugsl(i);
        //debug(res);
    }
    cout << res;

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 320 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 276 KB Output is correct
6 Incorrect 0 ms 212 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 320 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 276 KB Output is correct
6 Incorrect 0 ms 212 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Incorrect 0 ms 212 KB Output isn't correct
12 Halted 0 ms 0 KB -