明明定义了函数却说找不到？

#include <iostream>

using namespace std;

int petrolStation_1(int gas[],int cost[],int N)
{
    int k=-1;
    int max=0;
    for(int i=0;i<N;i++)
    {
        int sum=0;
        int count=0;
        for(int j=i;count<N;count++,j=(j+1)%N)
         {
            if(sum<0) break;
            sum+=(gas[j]-cost[j]);
         }   
        if(sum>=max) {k=i;max=sum;}
    }
    return k;
}
int pertolStation_2(int gas[],int cost[],int N)
{
    int *diff=new int[N];
    int sum=0;
    for(int i=0;i<N;i++)
    {
        diff[i]=gas[i]-cost[i];
        sum+=diff[i];
    }
    if(sum<0) return -1;
    sum=0;
    int startNode=0;
    for(int i=0;i<N;i++)
    {
        sum+=diff[i];
        if(sum<0)
        {
            sum=0;
            startNode=i+1;
        }
    }
    return startNode;
}
int main()
{
    int gas[]={2,0,3,4};
    int cost[]={1,2,1,4};
    int N=sizeof(gas)/sizeof(gas[0]);
    cout<<pertolStation_1(gas,cost,N)<<endl;
    cout<<pertolStation_2(gas,cost,N)<<endl;
    return 0;
}

E:\codeBlock\加油站\main.cpp|46|error: 'pertolStation_1' was not declared in this scope|

凌乱了，函数定义了啊，为毛说not declared