【題目敘述】https://zerojudge.tw/ShowProblem?problemid=e555
【解題想法】模擬
#include <iostream>
using namespace std;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
long long S, D, cnt;
while (cin >> S >> D){
cnt = S;
D -= S;
while (D > 0){
cnt++;
D -= cnt;
}
cout << cnt << "\n";
}
return 0;
}