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Giving a string "hello_world_yoyo", how to get a array
["hello","world","yoyo"]
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Giving a array
["hello","world","yoyo"]
, how to join the item in the array and get a string "hello_world_yoyo"? -
Replace a space in a strint to "%20", input: s="we are happy!", output: "we%20are%20happy."
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Use Python to print 99 Multiplication table
1x1=1 1x2=2 2x2=4 1x3=3 2x3=6 3x3=9 1x4=4 2x4=8 3x4=12 4x4=16 1x5=5 2x5=10 3x5=15 4x5=20 5x5=25 1x6=6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36 1x7=7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49 1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64 1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81
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Giving a sentence "Hello, welcome to my world", find the position of world "welcome", if not found, return "-1".