Jamie and To-do List

916D2200· master2s512 MB⇄ interactive

Examples

Sample 1of 4

Input

8
set chemlabreport 1
set physicsexercise 2
set chinesemockexam 3
query physicsexercise
query chinesemockexam
remove physicsexercise
query physicsexercise
query chinesemockexam

Output

Sample 2of 4

Input

8
set physicsexercise 2
set chinesemockexam 3
set physicsexercise 1
query physicsexercise
query chinesemockexam
undo 4
query physicsexercise
query chinesemockexam

Output

Sample 3of 4

Input

5
query economicsessay
remove economicsessay
query economicsessay
undo 2
query economicsessay

Output

-1
-1
-1

Sample 4of 4

Input

5
set economicsessay 1
remove economicsessay
undo 1
undo 1
query economicsessay

Output

-1

916D.cpp

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Ln 11·137 BGNU C++20 (64)

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