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#include <iostream> using namespace std; int main() { long long n, a, b; cin >> n >> a >> b; long long S = a; long long E = b; while(S <= E) { long long middle = (S + E) / 2; long long x = (middle * middle) + (200 * middle); long long tmp = middle; long long zbir = 0; while(tmp > 0) { zbir += (tmp % 10); tmp /= 10; } x += zbir; if(x == n) { cout << middle << endl; return 0; } if(x > n) { E = middle - 1; } else { S = middle + 1; } } cout << -1 << endl; return 0; }
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