00:00:00

Description

Editorial

Metal-Nonmetal Bond Candidate Matrix

EASY10 pts

A materials data platform stores a compact periodic-table snapshot and needs a simple matrix of all candidate ionic pairings.

Table: Elements

symbol: unique element code
type: one of Metal, Nonmetal, Noble
electrons: transfer metadata
- Noble has electrons = 0
- Metal has electrons indicating electrons it can donate
- Nonmetal has electrons indicating electrons it can accept

Pairing rule:

A valid candidate pair is any combination of one Metal element and one Nonmetal element.
No electron-equality condition is required.
Noble elements never appear in the output.

Task: Return all valid pairs in two columns:

metal
nonmetal

Supported submission environments:

SQL (SQLite 3.27.2)
Pandas (Python)

Example

Input

Elements:
| symbol | type     | electrons |
|--------|----------|-----------|
| Ne     | Noble    | 0         |
| Na     | Metal    | 1         |
| Mg     | Metal    | 2         |
| Al     | Metal    | 3         |
| Cl     | Nonmetal | 1         |
| O      | Nonmetal | 2         |
| N      | Nonmetal | 3         |

Output

[
  {"metal":"Al","nonmetal":"Cl"},
  {"metal":"Al","nonmetal":"N"},
  {"metal":"Al","nonmetal":"O"},
  {"metal":"Mg","nonmetal":"Cl"},
  {"metal":"Mg","nonmetal":"N"},
  {"metal":"Mg","nonmetal":"O"},
  {"metal":"Na","nonmetal":"Cl"},
  {"metal":"Na","nonmetal":"N"},
  {"metal":"Na","nonmetal":"O"}
]

Explanation

There are 3 metals and 3 nonmetals, so the result contains 3 x 3 = 9 combinations. Noble element Ne is ignored.

Example

Input

Elements:
| symbol | type  | electrons |
|--------|-------|-----------|
| He     | Noble | 0         |
| Ar     | Noble | 0         |
| Li     | Metal | 1         |
| Be     | Metal | 2         |

Output

[]

Explanation

There are no Nonmetal rows, so no valid pair can be formed.

Example

Input

Elements:
| symbol | type     | electrons |
|--------|----------|-----------|
| K      | Metal    | 1         |
| Ca     | Metal    | 2         |
| F      | Nonmetal | 1         |
| S      | Nonmetal | 2         |
| Xe     | Noble    | 0         |

Output

[
  {"metal":"Ca","nonmetal":"F"},
  {"metal":"Ca","nonmetal":"S"},
  {"metal":"K","nonmetal":"F"},
  {"metal":"K","nonmetal":"S"}
]

Explanation

Each metal pairs with each nonmetal. The electrons column provides metadata but does not reduce pair count.

Accepted0/0·0% Acceptance

Constraints

0 <= number of rows in Elements <= 220
symbol values are unique
1 <= length(symbol) <= 12
type is one of: Metal, Nonmetal, Noble
0 <= electrons <= 8
If type = Noble, then electrons = 0
If type = Metal or Nonmetal, then electrons >= 1
Output must contain exactly two columns: metal and nonmetal
Return one row for each Metal x Nonmetal combination
For SQL submissions, use SQLite 3.27.2 semantics
For Pandas submissions, return a DataFrame with columns metal and nonmetal

Code

Visualizer

Solutions

14px

Test Cases3

Results

Submissions

Elements =

[{"symbol":"Ne","type":"Noble","electrons":0},{"symbol":"Na","type":"Metal","electrons":1},{"symbol":"Mg","type":"Metal","electrons":2},{"symbol":"Al","type":"Metal","electrons":3},{"symbol":"Cl","type":"Nonmetal","electrons":1},{"symbol":"O","type":"Nonmetal","electrons":2},{"symbol":"N","type":"Nonmetal","electrons":3}]

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101

00:00:00

Description

Editorial

Metal-Nonmetal Bond Candidate Matrix

EASY10 pts

A materials data platform stores a compact periodic-table snapshot and needs a simple matrix of all candidate ionic pairings.

Table: Elements

symbol: unique element code
type: one of Metal, Nonmetal, Noble
electrons: transfer metadata
- Noble has electrons = 0
- Metal has electrons indicating electrons it can donate
- Nonmetal has electrons indicating electrons it can accept

Pairing rule:

A valid candidate pair is any combination of one Metal element and one Nonmetal element.
No electron-equality condition is required.
Noble elements never appear in the output.

Task: Return all valid pairs in two columns:

metal
nonmetal

Supported submission environments:

SQL (SQLite 3.27.2)
Pandas (Python)

Example

Input

Elements:
| symbol | type     | electrons |
|--------|----------|-----------|
| Ne     | Noble    | 0         |
| Na     | Metal    | 1         |
| Mg     | Metal    | 2         |
| Al     | Metal    | 3         |
| Cl     | Nonmetal | 1         |
| O      | Nonmetal | 2         |
| N      | Nonmetal | 3         |

Output

[
  {"metal":"Al","nonmetal":"Cl"},
  {"metal":"Al","nonmetal":"N"},
  {"metal":"Al","nonmetal":"O"},
  {"metal":"Mg","nonmetal":"Cl"},
  {"metal":"Mg","nonmetal":"N"},
  {"metal":"Mg","nonmetal":"O"},
  {"metal":"Na","nonmetal":"Cl"},
  {"metal":"Na","nonmetal":"N"},
  {"metal":"Na","nonmetal":"O"}
]

Explanation

There are 3 metals and 3 nonmetals, so the result contains 3 x 3 = 9 combinations. Noble element Ne is ignored.

Example

Input

Elements:
| symbol | type  | electrons |
|--------|-------|-----------|
| He     | Noble | 0         |
| Ar     | Noble | 0         |
| Li     | Metal | 1         |
| Be     | Metal | 2         |

Output

[]

Explanation

There are no Nonmetal rows, so no valid pair can be formed.

Example

Input

Elements:
| symbol | type     | electrons |
|--------|----------|-----------|
| K      | Metal    | 1         |
| Ca     | Metal    | 2         |
| F      | Nonmetal | 1         |
| S      | Nonmetal | 2         |
| Xe     | Noble    | 0         |

Output

[
  {"metal":"Ca","nonmetal":"F"},
  {"metal":"Ca","nonmetal":"S"},
  {"metal":"K","nonmetal":"F"},
  {"metal":"K","nonmetal":"S"}
]

Explanation

Each metal pairs with each nonmetal. The electrons column provides metadata but does not reduce pair count.

Accepted0/0·0% Acceptance

Constraints

0 <= number of rows in Elements <= 220
symbol values are unique
1 <= length(symbol) <= 12
type is one of: Metal, Nonmetal, Noble
0 <= electrons <= 8
If type = Noble, then electrons = 0
If type = Metal or Nonmetal, then electrons >= 1
Output must contain exactly two columns: metal and nonmetal
Return one row for each Metal x Nonmetal combination
For SQL submissions, use SQLite 3.27.2 semantics
For Pandas submissions, return a DataFrame with columns metal and nonmetal

Code

Visualizer

Solutions

14px

Test Cases3

Results

Submissions

Elements =

Metal-Nonmetal Bond Candidate Matrix

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Metal-Nonmetal Bond Candidate Matrix

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