Submission #1564460

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Source Code Expand

#include <cstdio>
#include <cmath>

using namespace std;

const int mod=998244353;
const double eps=0.00000001;

struct punct
{
    int x,y;
};

punct v[210];
int put[210];

int egal(double a,double b)
{
    if(abs(a-b)<eps) return 1;
    return 0;
}

int main()
{
    //freopen("file.in","r",stdin);
    //freopen("file.out","w",stdout);
    int n;
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        scanf("%d%d",&v[i].x,&v[i].y);
    put[0]=1;
    for(int i=1;i<=n;i++) put[i]=(1LL*put[i-1]*2)%mod;
    int sol=put[n];
    sol--;
    sol=(sol-n+mod)%mod;
    for(int i=1;i<n;i++)
        for(int j=i+1;j<=n;j++)
        {
            double a=0;
            int p=0;
            if(v[i].x!=v[j].x) a=1.0*(v[i].y-v[j].y)/(v[i].x-v[j].x);
            else p=1;
            double b=1.0*v[i].y-a*v[i].x;
            int cnt=0;
            for(int k=j+1;k<=n;k++)
                if(p==1) {if(v[k].x==v[i].x) cnt++;}
                else if(egal(1.0*v[k].y,a*v[k].x+b)==1) cnt++;
            sol=(sol-put[cnt]+mod)%mod;
        }
    printf("%d",sol);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:28:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:30:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&v[i].x,&v[i].y);
                                      ^

Judge Result