Gambling

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

int n,c,s,p,w;
double dp[2010][2010];

int main() {
    cin >> n >> c >> s >> p >> w;
    double k = (double) (s-p+1)/s;
    dp[0][c] = 1;
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < 2001; j++) {
            if (j-w > 0) dp[i][j] = dp[i-1][j-w]*k;
            dp[i][j] += dp[i-1][j+1]*(1-k);
        }
        dp[i][0] += dp[i-1][0];
    }
    double ans = 0;
    for (int j = 0; j <= c; j++) {
        ans += dp[n][j];
    }
    cout << setprecision(15) << 1-ans << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED