이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
#define endl '\n'
#define int long long
#define X first
#define Y second
using namespace std;
map <int, int> m;
signed main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int n, A, B;
cin >> n >> A >> B;
int ans = 0, MOD = log10(A) - log10(__gcd(A, B+1)) + log10(B) > 18 ? (long long)(1e18+1) : A / __gcd(A, B+1) * B;
while (n--) {
int l, r;
cin >> l >> r;
int L = l % MOD, R = r % MOD;
if (L < R) m[L]++, m[R+1]--;
else if (L > R) m[L]++, m[MOD]--, m[0]++, m[R+1]--;
else if (l == r) m[L]++, m[L+1]--;
else ans = MOD;
}
int sum = 0, f = 1, l;
if (ans != MOD) {
for (auto seg:m) {
//cout << seg.X << ' ' << seg.Y << endl;
sum += seg.Y;
if (sum and f) l = seg.X, f = 0;
else if (!sum) ans += seg.X - l, f = 1;
}
}
cout << ans << endl;
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
strange_device.cpp: In function 'int main()':
strange_device.cpp:32:32: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
32 | else if (!sum) ans += seg.X - l, f = 1;
| ~~~~~~^~~
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