Submission #58199

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Source Code Expand

import java.util.Arrays;
import java.util.Scanner;

public class Main {

	static Scanner sc = new Scanner(System.in);
	static int N;
	static int[] a, b;
	static long sum;

	public static void main(String[] args) {
		N = sc.nextInt();
		a = new int[N];
		b = new int[N];
		long max = 0;
		for (int i = 0; i < N; ++i) {
			a[i] = sc.nextInt();
			b[i] = sc.nextInt();
			sum += a[i];
		}
		for (int i = 0; i < N; ++i) {
			max = Math.max(max, (sum * b[i]) / a[i]);
		}
		for (long i = max;; --i) {
			if (!possible(i)) {
				System.out.println(i + 1);
				return;
			}
		}
	}

	static boolean possible(long m) {
		long[] count = new long[N];
		long all = 0;
		St[] rem = new St[N];
		boolean ok = true;
		for (int i = 0; i < N; ++i) {
			count[i] = a[i] * m / sum;
			all += count[i];
			rem[i] = new St(a[i] * m - count[i] * sum, i);
			if (count[i] < b[i]) ok = false;
		}
		if (ok) return true;
		Arrays.sort(rem);
		for (int i = 0; i < Math.min(m - all, N); ++i) {
			++count[rem[i].i];
		}
		//		System.out.println(m + " " + Arrays.toString(count) + " " + all);
		for (int i = 0; i < N; ++i) {
			if (count[i] < b[i]) return false;
		}
		return true;
	}

	static class St implements Comparable<St> {
		long c;
		int i;

		St(long c, int i) {
			this.c = c;
			this.i = i;
		}

		public int compareTo(St o) {
			if (this.c == o.c) return this.i - o.i;
			if (this.c > o.c) return -1;
			return 1;
		}
	}

}

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