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Gary is an avid hiker. He tracks his hikes meticulously, paying close attention to small details like topography. During his last hike he took exactly steps. For every step he took, he noted if it was an uphill, , or a downhill, step. Gary's hikes start and end at sea level and each step up or down represents a unit change in altitude. We define the following terms:


A mountain is a sequence of consecutive steps above sea level, starting with a step up from sea level and ending with a step down to sea level.

A valley is a sequence of consecutive steps below sea level, starting with a step down from sea level and ending with a step up to sea level.

Given Gary's sequence of up and down steps during his last hike, find and print the number of valleys he walked through.


For example, if Gary's path is , he first enters a valley units deep. Then he climbs out an up onto a mountain units high. Finally, he returns to sea level and ends his hike.


Function Description


Complete the countingValleys function in the editor below. It must return an integer that denotes the number of valleys Gary traversed.


countingValleys has the following parameter(s):


n: the number of steps Gary takes

s: a string describing his path

Input Format


The first line contains an integer , the number of steps in Gary's hike.

The second line contains a single string , of characters that describe his path.


Constraints


Output Format


Print a single integer that denotes the number of valleys Gary walked through during his hike.


imi puteti spune ce gresesc de imi da eroare de compilare?


#include

#include

using namespace std;

int main() {

string s;

int n, rez=0;

cin >> n;

getline(cin, s);

for (int i = 0; i < n; ++i)

if (s[i] == 'U' && s[i + 1] == 'D')

++rez;

cout << rez;

return 0;

}

Răspuns :

JolieJulie

Prima greseala pe care ai facut-o a fost sa declari s ca fiind string,dupa care sa verifici pozitiile acelui string (caracter)?? un caracter are doar o pozitie,fiind data de valoarea pe care i-o atribui.Deci trebuie declarat un sir de caractere : CHAR s[100] (10000 sau cat vrei ).

A doua greseala e ca nu ai contorizat nivelurile.O vale/ munte poate si mai adanca/inalt de 1 pas.Ideea e ca daca ai x pasi in jos,dupa care x pasi in sus,iar ultimul pas (adica tot un s[i]) e 'U',inseamna ca ai trecut printr-o vale si poti sa continui cu contorizatul.

#include<iostream>

#include<string.h>

using namespace std;

int countingValleys(int n,char s[])

{

   int nivel=0,rez=0;

   for(int i=0; i<n; i++) //parcurge toti pasii

   {

       if(s[i]=='U')//pasi in sus

           nivel++;

       if(s[i]=='D')//pasi in jos

           nivel--;

       if(nivel==0 && s[i]=='U')//verifica daca a facut acelasi nr de pasi in jos si sus

           //si daca ultimul pas e in sus,adica daca a iesit din vale

           rez++;

   }

   return rez;

}

int main ()

{

   char s[100];

   int n;

   cin>>s;//

   n=strlen(s);//n-nr pasilor

   cout<<countingValleys(n,s);

}

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