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Minimum Players required to win the game in C++
Problem statement
Given N questions and K options for each question, where 1 <= N <= 1000000000 and 1 <= K <= 1000000000. The task is to determine sum of total number of player who has attempted ith question for all 1 <= i <= k to win the game anyhow. You have to minimize the sum of total number of player and output it modulo 109+7.
Please note that any wrong answer leads to elimination of the player
Example
If N = 5 and K = 2 then answer is 62.
Algorithm
- To solve Nth question K players are needed.
- To solve (N-1)th question K2 players are needed.
- Similarly moving onwards, to solve 1st question KN players are needed.
- So, our problem reduces to finding the sum of GP terms K + K2 + … + KN which is equal to: K(Kn -1) / K -1
Example
#include <iostream>
#include <cmath>
#define MOD 1000000007
using namespace std;
long long int power(long long a, long long b) {
long long res = 1;
while (b) {
if (b & 1) {
res = res * a;
res = res % MOD;
}
b = b / 2;
a = a * a;
a = a % MOD;
}
return res;
}
long long getMinPlayer(long long n, long long k) {
long long num = ((power(k, n) - 1) + MOD) % MOD;
long long den = (power(k - 1, MOD - 2) + MOD) % MOD;
long long ans = (((num * den) % MOD) * k) % MOD;
return ans;
}
int main() {
long long n = 5, k = 2;
cout << "Minimum pairs = " << getMinPlayer(n, k) << endl;
return 0;
}Output
When you compile and execute above program. It generates following output −
Minimum pairs = 62
Updated on: 22-Nov-2019
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