yukicoder No.23

yukicoder23.cpp

#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define NUM 10001
typedef long long ll;

using namespace std;


int inputValue(){
    int a;
    cin >> a;
    return a;
};

void inputArray(int * p, int a){
    rep(i, a){
        cin >> p[i];
    }
};

void inputVector(vector<int> * p, int a){
    rep(i, a){
        int input;
        cin >> input;
        p -> push_back(input);
    }
}

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

float dp[NUM] = {0};

int main(int argc, const char * argv[]) {
    
    // source code
    int H = inputValue();
    int A = inputValue();
    int D = inputValue();

    dp[0] = 1;
    
    if(A >= D){
        output((int)(H / A) + 1, 0);
    }
    else{
        repd(i, 1, A + 1){
            dp[i] = 1.0;
        }
        repd(i, A + 1, D + 1){
            dp[i] = 1.5;
        }
        repd(i, D + 1, NUM){
            dp[i] = min(dp[i - A] + 1.0, dp[i - D] + 1.5);
        }
        output(dp[H], 0);
    }
    
    
    
    return 0;
}