2020 ICPC沈阳站-D,HD. Journey to Un'Goro (思维)H. The Boomsday Project (DP)
Recently, you've taken a trip to Un'Goro.A small road in Un'Goro has attracted your eyes. The road consists ofnsteps, each colored either red or blue.When you go from theiith step to thejth, you count the number of red steps you've stepped. You
