doukaku13_2.js

"use strict";

function solve(input) {
    var walls  = input.split("").map(Number);
    var waters = 0;

    for(var y = 1; y < 10; y++) {
        var w = 0;
        var inside = false;
        for(var x = 0; x < input.length; x++) {
            if(inside) {
                if(walls[x] === 0) {
                    inside = false;
                    w = 0;
                } else if(y < walls[x]) {
                    waters += w;
                    w = 0;
                } else {
                    w += 1;
                }
            } else if(y < walls[x]) {
                inside = true;
            }
        }
    }
    return waters.toString();
}

function test(input, expected) {
    var result = solve(input);
    if(result !== expected) {
        console.log("-------------\ninput = %s\n\nexpected = %s\nresult   = %s", input, expected, result);
    }
}

test( "83141310145169154671122"              , "24" );
test( "923111128"                            , "45" );
test( "923101128"                            , "1" );
test( "903111128"                            , "9" );
test( "3"                                    , "0" );
test( "31"                                   , "0" );
test( "412"                                  , "1" );
test( "3124"                                 , "3" );
test( "11111"                                , "0" );
test( "222111"                               , "0" );
test( "335544"                               , "0" );
test( "1223455321"                           , "0" );
test( "000"                                  , "0" );
test( "000100020003121"                      , "1" );
test( "1213141516171819181716151413121"      , "56" );
test( "712131415161718191817161514131216"    , "117" );
test( "712131405161718191817161514031216"    , "64" );
test( "03205301204342100"                    , "1" );
test( "0912830485711120342"                  , "18" );
test( "1113241120998943327631001"            , "20" );
test( "7688167781598943035023813337019904732", "41" );
test( "2032075902729233234129146823006063388", "79" );
test( "8323636570846582397534533"            , "44" );
test( "2142555257761672319599209190604843"   , "41" );
test( "06424633785085474133925235"           , "51" );
test( "503144400846933212134"                , "21" );
test( "1204706243676306476295999864"         , "21" );
test( "050527640248767717738306306596466224" , "29" );
test( "5926294098216193922825"               , "65" );
test( "655589141599534035"                   , "29" );
test( "7411279689677738"                     , "34" );
test( "268131111165754619136819109839402"    , "102" );