Submission #1567933

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Source Code Expand

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <string>
#include <cstring>
#include <stack>
#include <queue>
#include <cmath>
#include <ctime>
#include<bitset>
#include <utility>
using namespace std;
#define rank rankk
#define mp make_pair
#define pb push_back
#define xo(a,b) ((b)&1?(a):0)
//#define LL ll
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef long long ll;
typedef pair<ll,int> pli;
const int INF=0x3f3f3f3f;
const ll INFF=0x3f3f3f3f3f3f3f3fll;
const int MAX=1e5+5;
const int MAX_N=MAX;
const ll MOD=998244353;
const long double pi=acos(-1.0);
//const double eps=0.00000001;
int gcd(int a,int b){return b?gcd(b,a%b):a;}
template<typename T>inline T abs(T a) {return a>0?a:-a;}
template<class T> inline
void read(T& num) {
    bool start=false,neg=false;
    char c;
    num=0;
    while((c=getchar())!=EOF) {
        if(c=='-') start=neg=true;
        else if(c>='0' && c<='9') {
            start=true;
            num=num*10+c-'0';
        } else if(start) break;
    }
    if(neg) num=-num;
}
inline ll powMM(ll a,ll b,ll M){
    ll ret=1;
    a%=M;
//    b%=M;
    while (b){
        if (b&1) ret=ret*a%M;
        b>>=1;
        a=a*a%M;
    }
    return ret;
}
void open()
{
    freopen("1009.in","r",stdin);
    freopen("out.txt","w",stdout);
}
int n,cnt;
ll mi[205];
int x[205],y[205];
ll an;
inline bool check(int i,int j,int k)
{
    return ((x[i]-x[j])*(y[k]-y[j])-(x[k]-x[j])*(y[i]-y[j]))==0;
}
int main()
{
    scanf("%d",&n);
    mi[0]=1;for(int i=1;i<=n;i++)mi[i]=2*mi[i-1]%MOD;
    for(int i=1;i<=n;i++)scanf("%d%d",&x[i],&y[i]);
    an=(mi[n]-1-n+MOD)%MOD;
    for(int i=1;i<=n-1;i++)
        for(int j=i+1;j<=n;j++,an=(an-mi[cnt]+MOD)%MOD,cnt=0)
            for(int k=j+1;k<=n;k++)
                if(check(i,j,k))++cnt;
    printf("%lld\n",an);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void open()’:
./Main.cpp:61:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
     freopen("1009.in","r",stdin);
                                 ^
./Main.cpp:62:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
     freopen("out.txt","w",stdout);
                                  ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:74:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:76:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=n;i++)scanf("%d%d",&x[i],&y[i]);
                                                   ^

Judge Result