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  • #include <bits/stdc++.h>
    using namespace std;
    
    int main() {
        int n;
        cin >> n;
        int sum = 0,i = 1,now;
        while (sum < n){
            now = i;
            sum += i;
            i ++;
        }
        if (now % 2 == 0) cout << now + n - sum << "/" << sum - n + 1;
        else cout << sum - n + 1 << "/" << now + n - sum;
    }
    

    2026-08-03 来自 上海

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