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#include <iostream>
#include <cmath>
using namespace std;
 
int main() {
    int n;
    cin >> n;
    cout << round(sqrt(2 * n));
    return 0;
}

Success #stdin #stdout 0s 4548KB

stdin

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stdout

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https://ideone.com/mXhYQd

Задача на сайт 2 (e-olymp 398)

language:

C++ (gcc 8.3)

created:

visibility:

public

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