This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#ifdef ngu
#include "debug.h"
#else
#define debug(...) 42
#endif
const int N = (int) 3e5 + 5;
int n, m;
int a[N], b[N];
bool check(long long mid) {
long long cnt = 0;
for (int i = 1; i <= n; ++i) {
if (a[i] < b[i]) {
cnt += (mid - 1) / b[i] + 1;
} else {
if (1LL * a[i] * m >= mid) {
cnt += (mid - 1) / a[i] + 1;
} else {
cnt += (mid - 1LL * a[i] * m - 1) / b[i] + m + 1;
}
}
}
return cnt <= 1LL * n * m;
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
#ifdef ngu
freopen("test.inp", "r", stdin);
freopen("test.out", "w", stdout);
#endif
cin >> n >> m;
for (int i = 1; i <= n; ++i) {
cin >> a[i];
}
for (int i = 1; i <= n; ++i) {
cin >> b[i];
}
long long l = 1, r = 1e18, res = 0;
while (l <= r) {
long long mid = l + r >> 1;
if (check(mid)) {
res = mid;
l = mid + 1;
} else {
r = mid - 1;
}
}
cout << res;
}
Compilation message (stderr)
Main.cpp: In function 'int main()':
Main.cpp:48:27: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
48 | long long mid = l + r >> 1;
| ~~^~~
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