A simple but unsolved problem with ACMP. C++

Question

A simple but unsolved problem with ACMP. C++

Task condition :

The deposit in the bank is X rubles. Every year it increases by P percent, after which the fractional part of the kopecks is discarded.

It is necessary to determine: after how many years the contribution will be at least Y rubles.

Input data Input file INPUT.TXT contains three natural numbers: X, P, and Y (X, Y ≤ 1000, P ≤ 100).

Output data to the output file OUTPUT.TXT output an integer- the answer to the task.

Solution code:

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

int main()
{
    int x, p, y, cnt = 0;
    cin >> x >> p >> y;
    while (x < y)
    {
        x *= 1 + p / 100.0;
        cnt++;
    }
    cout << cnt;
}

The decision did not count. Floating point problem? in the line x *= 1 + p / 100.0 there are no errors with the casts for sure (by 99%) I checked. What could be the problem?

0

c++олимпиада

Author: Grundy, 2020-07-06

Source

1 answers

score 2 · Accepted Answer

The floating point is not needed here at all. Work in kopecks.

int x, p, y, cnt = 0;
cin >> x >> p >> y;

x = x * 100;
y = y * 100;
p = p + 100;
while (x < y)
{
    x = (x * p) / 100;
    cnt++;
}