Earliest Finish Time for Land and Water Rides I
<p data-end="143" data-start="53">You are given two categories of theme park attractions: <strong data-end="122" data-start="108">land rides</strong> and <strong data-end="142" data-start="127">water rides</strong>.</p>

<ul>
	<li data-end="163" data-start="147"><strong data-end="161" data-start="147">Land rides</strong>

    <ul>
    	<li data-end="245" data-start="168"><code data-end="186" data-start="168">landStartTime[i]</code> &ndash; the earliest time the <code>i<sup>th</sup></code> land ride can be boarded.</li>
    	<li data-end="306" data-start="250"><code data-end="267" data-start="250">landDuration[i]</code> &ndash; how long the <code>i<sup>th</sup></code> land ride lasts.</li>
    </ul>
    </li>
    <li><strong data-end="325" data-start="310">Water rides</strong>
    <ul>
    	<li><code data-end="351" data-start="332">waterStartTime[j]</code> &ndash; the earliest time the <code>j<sup>th</sup></code> water ride can be boarded.</li>
    	<li><code data-end="434" data-start="416">waterDuration[j]</code> &ndash; how long the <code>j<sup>th</sup></code> water ride lasts.</li>
    </ul>
    </li>

</ul>

<p data-end="569" data-start="476">A tourist must experience <strong data-end="517" data-start="502">exactly one</strong> ride from <strong data-end="536" data-start="528">each</strong> category, in <strong data-end="566" data-start="550">either order</strong>.</p>

<ul>
	<li data-end="641" data-start="573">A ride may be started at its opening time or <strong data-end="638" data-start="618">any later moment</strong>.</li>
	<li data-end="715" data-start="644">If a ride is started at time <code data-end="676" data-start="673">t</code>, it finishes at time <code data-end="712" data-start="698">t + duration</code>.</li>
	<li data-end="834" data-start="718">Immediately after finishing one ride the tourist may board the other (if it is already open) or wait until it opens.</li>
</ul>

<p data-end="917" data-start="836">Return the <strong data-end="873" data-start="847">earliest possible time</strong> at which the tourist can finish both rides.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">landStartTime = [2,8], landDuration = [4,1], waterStartTime = [6], waterDuration = [3]</span></p>

<p><strong>Output:</strong> <span class="example-io">9</span></p>

<p><strong>Explanation:</strong>​​​​​​​</p>

<ul>
	<li data-end="181" data-start="145">Plan A (land ride 0 &rarr; water ride 0):
	<ul>
		<li data-end="272" data-start="186">Start land ride 0 at time <code data-end="234" data-start="212">landStartTime[0] = 2</code>. Finish at <code data-end="271" data-start="246">2 + landDuration[0] = 6</code>.</li>
		<li data-end="392" data-start="277">Water ride 0 opens at time <code data-end="327" data-start="304">waterStartTime[0] = 6</code>. Start immediately at <code data-end="353" data-start="350">6</code>, finish at <code data-end="391" data-start="365">6 + waterDuration[0] = 9</code>.</li>
	</ul>
	</li>
	<li data-end="432" data-start="396">Plan B (water ride 0 &rarr; land ride 1):
	<ul>
		<li data-end="526" data-start="437">Start water ride 0 at time <code data-end="487" data-start="464">waterStartTime[0] = 6</code>. Finish at <code data-end="525" data-start="499">6 + waterDuration[0] = 9</code>.</li>
		<li data-end="632" data-start="531">Land ride 1 opens at <code data-end="574" data-start="552">landStartTime[1] = 8</code>. Start at time <code data-end="593" data-start="590">9</code>, finish at <code data-end="631" data-start="605">9 + landDuration[1] = 10</code>.</li>
	</ul>
	</li>
	<li data-end="672" data-start="636">Plan C (land ride 1 &rarr; water ride 0):
	<ul>
		<li data-end="763" data-start="677">Start land ride 1 at time <code data-end="725" data-start="703">landStartTime[1] = 8</code>. Finish at <code data-end="762" data-start="737">8 + landDuration[1] = 9</code>.</li>
		<li data-end="873" data-start="768">Water ride 0 opened at <code data-end="814" data-start="791">waterStartTime[0] = 6</code>. Start at time <code data-end="833" data-start="830">9</code>, finish at <code data-end="872" data-start="845">9 + waterDuration[0] = 12</code>.</li>
	</ul>
	</li>
	<li data-end="913" data-start="877">Plan D (water ride 0 &rarr; land ride 0):
	<ul>
		<li data-end="1007" data-start="918">Start water ride 0 at time <code data-end="968" data-start="945">waterStartTime[0] = 6</code>. Finish at <code data-end="1006" data-start="980">6 + waterDuration[0] = 9</code>.</li>
		<li data-end="1114" data-start="1012">Land ride 0 opened at <code data-end="1056" data-start="1034">landStartTime[0] = 2</code>. Start at time <code data-end="1075" data-start="1072">9</code>, finish at <code data-end="1113" data-start="1087">9 + landDuration[0] = 13</code>.</li>
	</ul>
	</li>
</ul>

<p data-end="1161" data-is-last-node="" data-is-only-node="" data-start="1116">Plan A gives the earliest finish time of 9.</p>
</div>

<p><strong class="example">Example 2:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">landStartTime = [5], landDuration = [3], waterStartTime = [1], waterDuration = [10]</span></p>

<p><strong>Output:</strong> <span class="example-io">14</span></p>

<p><strong>Explanation:</strong>​​​​​​​</p>

<ul data-end="1589" data-start="1086">
	<li data-end="1124" data-start="1088">Plan A (water ride 0 &rarr; land ride 0):
	<ul>
		<li data-end="1219" data-start="1129">Start water ride 0 at time <code data-end="1179" data-start="1156">waterStartTime[0] = 1</code>. Finish at <code data-end="1218" data-start="1191">1 + waterDuration[0] = 11</code>.</li>
		<li data-end="1338" data-start="1224">Land ride 0 opened at <code data-end="1268" data-start="1246">landStartTime[0] = 5</code>. Start immediately at <code data-end="1295" data-start="1291">11</code> and finish at <code data-end="1337" data-start="1310">11 + landDuration[0] = 14</code>.</li>
	</ul>
	</li>
	<li data-end="1378" data-start="1342">Plan B (land ride 0 &rarr; water ride 0):
	<ul>
		<li data-end="1469" data-start="1383">Start land ride 0 at time <code data-end="1431" data-start="1409">landStartTime[0] = 5</code>. Finish at <code data-end="1468" data-start="1443">5 + landDuration[0] = 8</code>.</li>
		<li data-end="1589" data-start="1474">Water ride 0 opened at <code data-end="1520" data-start="1497">waterStartTime[0] = 1</code>. Start immediately at <code data-end="1546" data-start="1543">8</code> and finish at <code data-end="1588" data-start="1561">8 + waterDuration[0] = 18</code>.</li>
	</ul>
	</li>
</ul>

<p data-end="1640" data-is-last-node="" data-is-only-node="" data-start="1591">Plan A provides the earliest finish time of 14.<strong>​​​​​​​</strong></p>
</div>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li data-end="38" data-start="16"><code data-end="36" data-start="16">1 &lt;= n, m &lt;= 100</code></li>
	<li data-end="93" data-start="41"><code data-end="91" data-start="41">landStartTime.length == landDuration.length == n</code></li>
	<li data-end="150" data-start="96"><code data-end="148" data-start="96">waterStartTime.length == waterDuration.length == m</code></li>
	<li data-end="237" data-start="153"><code data-end="235" data-start="153">1 &lt;= landStartTime[i], landDuration[i], waterStartTime[j], waterDuration[j] &lt;= 1000</code></li>
</ul>
func earliestFinishTime(landStartTime []int, landDuration []int, waterStartTime []int, waterDuration []int) int {
	x := calc(landStartTime, landDuration, waterStartTime, waterDuration)
	y := calc(waterStartTime, waterDuration, landStartTime, landDuration)
	return min(x, y)
}

func calc(a1 []int, t1 []int, a2 []int, t2 []int) int {
	minEnd := math.MaxInt32
	for i := 0; i < len(a1); i++ {
		minEnd = min(minEnd, a1[i]+t1[i])
	}
	ans := math.MaxInt32
	for i := 0; i < len(a2); i++ {
		ans = min(ans, max(minEnd, a2[i])+t2[i])
	}
	return ans
}
