Algorithm

C. Queue
time limit per test
2 seconds
memory limit per test
256 megabytes
Problem Link- https://codeforces.com/problemset/problem/141/C
input
standard input
output
standard output

In the Main Berland Bank n people stand in a queue at the cashier, everyone knows his/her height hi, and the heights of the other people in the queue. Each of them keeps in mind number ai — how many people who are taller than him/her and stand in queue in front of him.

After a while the cashier has a lunch break and the people in the queue seat on the chairs in the waiting room in a random order.

When the lunch break was over, it turned out that nobody can remember the exact order of the people in the queue, but everyone remembers his number ai.

Your task is to restore the order in which the people stood in the queue if it is possible. There may be several acceptable orders, but you need to find any of them. Also, you need to print a possible set of numbers hi — the heights of people in the queue, so that the numbers ai are correct.

Input

The first input line contains integer n — the number of people in the queue (1 ≤ n ≤ 3000). Then n lines contain descriptions of the people as "namei ai" (one description on one line), where namei is a non-empty string consisting of lowercase Latin letters whose length does not exceed 10 characters (the i-th person's name), ai is an integer (0 ≤ ai ≤ n - 1), that represents the number of people who are higher and stand in the queue in front of person i. It is guaranteed that all names are different.

Output

If there's no acceptable order of the people in the queue, print the single line containing "-1" without the quotes. Otherwise, print in n lines the people as "namei hi", where hi is the integer from 1 to 109 (inclusive), the possible height of a man whose name is namei. Print the people in the order in which they stand in the queue, starting from the head of the queue and moving to its tail. Numbers hi are not necessarily unique.

Examples
input
Copy
4
a 0
b 2
c 0
d 0
output
Copy
a 150
c 170
d 180
b 160
input
Copy
4
vasya 0
petya 1
manya 3
dunay 3
output
Copy
-1



 

Code Examples

#1 Code Example with C++ Programming

Code - C++ Programming

#include<iostream>
#include<vector>
#include<algorithm>

int main(){

    std::ios_base::sync_with_stdio(false);
    long n; std::cin >> n;

    std::vector<std::pair<long, std::string> > a(n);
    for(long p = 0; p < n; p++){std::cin >> a[p].second >> a[p].first;}
    sort(a.begin(), a.end());

    bool possible(true);
    std::vector<long> h(n);
    for(long p = 0; p < n; p++){
        h[p] = p - a[p].first;
        if (h[p] < 0){possible = false; break;}
        ++h[p]; //Avoid zero height;
        for(long q = 0; q < p; q++){if(h[q] >= h[p]){++h[q];}}
    }

    if(possible){for(long p = 0; p < n; p++){std::cout << a[p].second << " " << h[p] << std::endl;}}
    else{puts("-1");}

    return 0;
}
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Input

x
–
+
cmd
4
a 0
b 2
c 0
d 0

Output

x
–
+
cmd
a 150
c 170
d 180
b 160
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Demonstration

Codeforces Solution-C. Queue-Solution in C, C++, Java, Python

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