请问一下，为什么是30分？？？新手懵了

#include<bits/stdc++.h>
using namespace std;
int a[105][105],r,c,ans,minn=5000000,m1,m2;
int maxxxx(int a,int b,int c,int d){
    int aa=max(a,c),bb=max(b,d);
    return max(aa,bb);
}
void f(int x,int y){
    ans++;
    if(a[x][y]==minn) return;
    if(maxxxx(a[x+1][y],a[x][y+1],a[x-1][y],a[x][y-1])==a[x+1][y]){
        f(x+1,y);
    }
    if(maxxxx(a[x+1][y],a[x][y+1],a[x-1][y],a[x][y-1])==a[x][y+1]){
        f(x,y+1);
    }
    if(maxxxx(a[x+1][y],a[x][y+1],a[x-1][y],a[x][y-1])==a[x-1][y]){
        f(x-1,y);
    }
    if(maxxxx(a[x+1][y],a[x][y+1],a[x-1][y],a[x][y-1])==a[x][y-1]){
        f(x,y-1);
    }
}
int main(){
    cin>>r>>c;
    for(int i=1;i<=r;i++){
        for(int j=1;j<=c;j++){
            cin>>a[i][j];
            if(a[i][j]>a[m1][m2]) m1=i,m2=j;
            if(a[i][j]<minn) minn=a[i][j];
        }
    }
    f(m1,m2);
    cout<<ans;
}