Submission #1560563

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Source Code Expand

#include <vector> 
#include <list> 
#include <map> 
#include <set> 
#include <deque> 
#include <queue> 
#include <stack> 
#include <bitset> 
#include <algorithm> 
#include <functional> 
#include <numeric> 
#include <utility> 
#include <sstream> 
#include <iostream> 
#include <iomanip> 
#include <cstdio> 
#include <cmath> 
#include <cstdlib> 
#include <cctype> 
#include <string> 
#include <cstring> 
#include <ctime> 

using namespace std;

#define _int64 long long
#define mo 998244353

int used[210][210];
int x[210];
int y[210];
int pow2[210];

int main()
{
  int i,j,k,n,ans,o,p,b1;
  vector<int> q;
  pow2[0]=1;
  for (i=1;i<210;i++)
  {
    pow2[i]=pow2[i-1]+pow2[i-1];
    pow2[i]%=mo;
  }
  scanf("%d",&n);
  for (i=0;i<n;i++)
    scanf("%d%d",&x[i],&y[i]);
  ans=pow2[n];
  ans--;
  ans-=n;
  ans+=mo;
  ans%=mo;
  memset(used,0,sizeof(used));
  for (i=0;i<n;i++)
    for (j=i+1;j<n;j++)
      if (used[i][j]==0)
      {
        q.clear();
        q.push_back(i);
        q.push_back(j);
        for (k=j+1;k<n;k++)
        {
          b1=0;
          if ((x[i]==x[j])&&(x[k]==x[i])) b1=1;
          else if ((y[i]==y[j])&&(y[k]==y[i])) b1=1;
          else
          {
            if ((y[j]-y[i])*(x[k]-x[i])==(y[k]-y[i])*(x[j]-x[i])) b1=1;
          }
          if (b1==1) q.push_back(k);
        }
        ans-=pow2[q.size()];
        ans+=q.size();
        ans++;
        ans%=mo;
        ans+=mo;
        ans%=mo;
        for (o=0;o<q.size();o++)
          for (p=o+1;p<q.size();p++)
            used[q[o]][q[p]]=1;
      }
  printf("%d\n",ans);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:44:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
                 ^
./Main.cpp:46:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&x[i],&y[i]);
                              ^

Judge Result