P2312 解方程

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论const 与变量的速度差

QAQ

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int p=1000000007;
ll n,m,cnt,a[110],temp=0,num[1000003];
int flag,sum,i,k,j;
inline ll read()
{
    ll sum=0,fg=1;char c=getchar();
    while(c<'0'||c>'9'){if(c=='-') fg=-1;c=getchar();}
    while(c>='0'&&c<='9'){sum=((sum*10)+c-'0')%p;c=getchar();}
    return sum*fg;
}
inline bool calc(int x)
{
    sum=0;
    for(i=n;i>=1;i--)sum=((a[i]+sum)*x)%p;
    sum=(sum+a[0])%p;
    return !sum;
}
int main()
{
    n=read();m=read();
    for(i=0;i<=n;i++)a[i]=read();
    for(j=1;j<=m;j++)if(calc(j))num[++temp]=j;
    cout<<temp<<endl;
    for(i=1;i<=temp;i++)
    printf("%lld\n",num[i]);
}

标签：const,int,sum,P2312,read,解方程,ll,getchar
来源： https://www.cnblogs.com/SFWR-YOU/p/10969671.html