Language: C++

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
#define maxn 100010
using namespace std;
int read()
{
    int x=0,f=1;
    char ch=getchar();
    while(ch-'0'<0||ch-'0'>9){if(ch=='-') f=-1;ch=getchar();}
    while(ch-'0'>=0&&ch-'0'<=9){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
int n;
int head[maxn],nxt[maxn*2],to[maxn*2],tot;
void add(int u,int v)
{
    tot++;
    nxt[tot]=head[u];
    head[u]=tot;
    to[tot]=v;
}
int used[maxn];
void solve(int x,int las)
{
    for(int i=head[x];i;i=nxt[i])
    {
        if(to[i]==las)  continue;
        solve(to[i],x);
    }
    if(!used[x])
    {
        if(used[las])
        {
            puts("First");
            exit(0);
        }#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
#define maxn 100010
using namespace std;
int read()
{
    int x=0,f=1;
    char ch=getchar();
    while(ch-'0'<0||ch-'0'>9){if(ch=='-') f=-1;ch=getchar();}
    while(ch-'0'>=0&&ch-'0'<=9){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
int n;
int head[maxn],nxt[maxn*2],to[maxn*2],tot;
void add(int u,int v)
{
    tot++;
    nxt[tot]=head[u];
    head[u]=tot;
    to[tot]=v;
}
int used[maxn];
void solve(int x,int las)
{
    for(int i=head[x];i;i=nxt[i])
    {
        if(to[i]==las)  continue;
        solve(to[i],x);
    }
    if(!used[x])
    {
        if(used[las])
        {
            puts("First");
            exit(0);
        }
        used[x]=used[las]=1;
    }
}
int main()
{
    n=read();
    for(int i=1;i<n;i++)
    {
        int q=read(),w=read();
        add(q,w);
        add(w,q);
    }
    used[0]=1;
    solve(1,0);
    puts("Second");
    return 0;
}

Compiler output:
a.cc:39:10: error: stray '#' in program
   39 |         }#include<iostream>
      |          ^
a.cc: In function 'void solve(int, int)':
a.cc:39:11: error: 'include' was not declared in this scope
   39 |         }#include<iostream>
      |           ^~~~~~~
a.cc:39:27: error: expected primary-expression before '>' token
   39 |         }#include<iostream>
      |                           ^
a.cc:45:1: error: expected primary-expression before 'using'
   45 | using namespace std;
      | ^~~~~
a.cc:46:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   46 | int read()
      |         ^~
a.cc:46:9: note: remove parentheses to default-initialize a variable
   46 | int read()
      |         ^~
      |         --
a.cc:46:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:47:1: error: a function-definition is not allowed here before '{' token
   47 | {
      | ^
a.cc:57:1: error: a function-definition is not allowed here before '{' token
   57 | {
      | ^
a.cc:65:1: error: a function-definition is not allowed here before '{' token
   65 | {
      | ^
a.cc:81:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   81 | int main()
      |         ^~
a.cc:81:9: note: remove parentheses to default-initialize a variable
   81 | int main()
      |         ^~
      |         --
a.cc:81:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:82:1: error: a function-definition is not allowed here before '{' token
   82 | {
      | ^
a.cc:94:2: error: expected '}' at end of input
   94 | }
      |  ^
a.cc:34:5: note: to match this '{'
   34 |     {
      |     ^
a.cc:94:2: error: expected '}' at end of input
   94 | }
      |  ^
a.cc:27:1: note: to match this '{'
   27 | {
      | ^