Submission

[PPPPPPPPP]

Score: 100

User: Dormon

Problemset: ขนมของเซ้น143 (v.ง่าย)

Language: cpp

Time: 0.003 second

Submitted On: 2024-12-03 09:54:22

#include <iostream>
#include <cstring>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>

#define debug(...) Debug(#__VA_ARGS__, __VA_ARGS__)
using namespace std;
const bool TEST_CASE = 0;

template<typename T>
typename std::enable_if<std::is_integral<T>::value>::type
Debug(const char* name, T value) {
    std::cout << name << " : " << value << '\n';
}

template<typename T, typename... Args>
typename std::enable_if<std::is_integral<T>::value>::type
Debug(const char* names, T value, Args... args) {
    const char* comma = strchr(names, ',');
    std::cout.write(names, comma - names) << " : " << value << " | ";
    Debug(comma + 1, args...);
}

void solve(){
    int64_t n;
    cin >> n;

    auto sum = [&](int64_t a) -> int64_t {
        return a*(a+1)/2;
    };
    int64_t all = sum(n);

    int64_t l = 0, r = n, ans = 1e9+0ll;
    while (l <= r){
        int64_t mid = l+r>>1ll;
        int64_t a = sum(mid), b = all - a;
        ans = min(ans, abs(a - b));
        if (a > b)
            r = mid-1;
        else 
            l = mid+1;
        //debug(a, b, mid, ans);
    }
    cout << ans << '\n';
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    int q = 1; 
    if (TEST_CASE) cin >> q;
    while (q--){
        solve();
    }
}