Submission #1563942


Source Code Expand

#include <stdio.h>
#include <string.h>
#include <algorithm>

const int kN = 200 + 5;
const int MOD = 998244353;
int n;

struct Point {
    int x, y;

    Point() {}

    Point(int x, int y): x(x), y(y) {}

    Point operator - (const Point &rhs) const
    {
        return Point(x - rhs.x, y - rhs.y);
    }

    void read()
    {
        scanf("%d%d", &x, &y);
    }

    bool operator < (const Point &rhs) const
    {
        return x < rhs.x || x == rhs.x && y < rhs.y;
    }
};

int det(const Point &a, const Point &b)
{
    return a.x * b.y - a.y * b.x;
}

int det(const Point &a, const Point &b, const Point &c)
{
    return det(b - a, c - a);
}

int inverse(int x)
{
    return x == 1 ? x : (MOD - MOD / x) * 1ll * inverse(MOD % x) % MOD;
}

inline void add(int &a, int b)
{
    a += b;
    if (a < 0) a += MOD;
    else if (a >= MOD) a -= MOD;
}

inline int mul(int x)
{
    return x;
}

template<typename... Args>
inline int mul(int x, Args... args)
{
    return x * 1ll * mul(args...) % MOD;
}

Point pt[kN];

int pw[kN];

int work()
{
    pw[0] = 1;
    for (int i = 1; i < kN; ++ i)
        pw[i] = mul(pw[i - 1], 2);
    int ret = pw[n];
    add(ret, -1 - n);
    for (int i = 0; i < n; ++ i) {
        for (int j = i + 1; j < n; ++ j) {
            int cnt = 0;
            for (int k = j + 1; k < n; ++ k)
                if (det(pt[i], pt[j], pt[k]) == 0)
                    ++ cnt;
            add(ret, -pw[cnt]);
        }
    }
    return ret;
}

int main()
{
    scanf("%d", &n);
    for (int i = 0; i < n; ++ i)
        pt[i].read();
    printf("%d\n", work());
}

Submission Info

Submission Time
Task E - ConvexScore
User Nero
Language C++14 (GCC 5.4.1)
Score 700
Code Size 1680 Byte
Status AC
Exec Time 3 ms
Memory 128 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:90:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp: In member function ‘void Point::read()’:
./Main.cpp:23:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
                              ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 700 / 700
Status
AC × 3
AC × 36
Set Name Test Cases
Sample 0_000.txt, 0_001.txt, 0_002.txt
All 0_000.txt, 0_001.txt, 0_002.txt, 1_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt, 1_023.txt, 1_024.txt, 1_025.txt, 1_026.txt, 1_027.txt, 1_028.txt, 1_029.txt, 1_030.txt, 1_031.txt, 1_032.txt, 1_033.txt, 1_034.txt, 1_035.txt
Case Name Status Exec Time Memory
0_000.txt AC 1 ms 128 KB
0_001.txt AC 1 ms 128 KB
0_002.txt AC 1 ms 128 KB
1_003.txt AC 1 ms 128 KB
1_004.txt AC 0 ms 128 KB
1_005.txt AC 1 ms 128 KB
1_006.txt AC 0 ms 128 KB
1_007.txt AC 2 ms 128 KB
1_008.txt AC 1 ms 128 KB
1_009.txt AC 1 ms 128 KB
1_010.txt AC 1 ms 128 KB
1_011.txt AC 1 ms 128 KB
1_012.txt AC 2 ms 128 KB
1_013.txt AC 1 ms 128 KB
1_014.txt AC 1 ms 128 KB
1_015.txt AC 2 ms 128 KB
1_016.txt AC 1 ms 128 KB
1_017.txt AC 3 ms 128 KB
1_018.txt AC 3 ms 128 KB
1_019.txt AC 3 ms 128 KB
1_020.txt AC 3 ms 128 KB
1_021.txt AC 3 ms 128 KB
1_022.txt AC 3 ms 128 KB
1_023.txt AC 3 ms 128 KB
1_024.txt AC 3 ms 128 KB
1_025.txt AC 3 ms 128 KB
1_026.txt AC 3 ms 128 KB
1_027.txt AC 3 ms 128 KB
1_028.txt AC 3 ms 128 KB
1_029.txt AC 3 ms 128 KB
1_030.txt AC 3 ms 128 KB
1_031.txt AC 3 ms 128 KB
1_032.txt AC 3 ms 128 KB
1_033.txt AC 3 ms 128 KB
1_034.txt AC 3 ms 128 KB
1_035.txt AC 3 ms 128 KB