Elevator Trouble

input/code.cpp: In function 'int main()':
input/code.cpp:9:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d%d%d",&f,&s,&g,&u,&d);
                                       ^

#include <cstdio>
#include <queue>
#include <algorithm>
using namespace std;
const int inf = 1000000007;
int main()
{
    int f,s,g,u,d;
    scanf("%d%d%d%d%d",&f,&s,&g,&u,&d);
    vector<int> M(f,inf);
    s--;
    g--;
    M[s]=0;
    queue<int> q;
    q.push(s);

    while(!q.empty())
    {
        int x = q.front();
        q.pop();
        int y = x+u;
        if(y<f && M[y]==inf)
        {
            M[y] = M[x]+1;
            q.push(y);
        }
        y = x-d;
        if(y>=0 && M[y]==inf)
        {
            M[y] = M[x]+1;
            q.push(y);
        }
    }
    if(M[g]==inf)
        puts("use the stairs");
    else
        printf("%d",M[g]);
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED