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input/code.cpp: In function 'int f(int, int)':
input/code.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[x].size(); ++i) {
                      ^
input/code.cpp: In function 'int main()':
input/code.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < alku.size(); ++i) {
                      ^

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#define F first
#define S second
using namespace std;

const int MN = 1e5+100;
int n,m,w;
vector<int> v[MN];
int crd[MN][2];
vector<bool> used(MN);
int ed2, x2;
const double PI = atan(1)*4;
double getAngle(int a) {
    //y, x
    double lol = atan2(crd[ed2][1]-crd[x2][1], crd[ed2][0]-crd[x2][0]) 
    - atan2(crd[a][1]-crd[x2][1], crd[a][0] - crd[x2][0]);
    lol = fmod(lol, 2*PI);
    lol += 2*PI;
    lol = fmod(lol, 2*PI);
    return lol;
}
bool cmp(int a, int b) {
    return getAngle(a) > getAngle(b);
}
int f(int ed, int x) {
    used[x] = 1;
    if(crd[x][0] == w) {
        return 1;
    }
    ed2 = ed;
    x2 = x;
    sort(v[x].begin(), v[x].end(), cmp);
    for(int i = 0; i < v[x].size(); ++i) {
        int y = v[x][i];
        if(!used[y]) {
            if(f(0, y)) return 1;
        }
    }
    return 0;
}
int main() {
    cin>>n>>m>>w;
    vector<pair<int, int> > alku, loppu;
    for(int i = 1; i <= n; ++i) {
        cin>>crd[i][0]>>crd[i][1];
        if(crd[i][0] == 0) alku.push_back({crd[i][1], i});
        if(crd[i][0] == w) loppu.push_back({crd[i][1], i});
    }
    crd[0][0] = -100;
    crd[0][1] = 0;
    sort(alku.begin(), alku.end());
    sort(loppu.begin(), loppu.end());
    for(int i = 0; i < m; ++i) {
        int a,b;
        cin>>a>>b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    int ans = 0;
    for(int i = 0; i < alku.size(); ++i) {
        if(!used[alku[i].S]) {
            if(f(0, alku[i].S)) ++ans;
        }
    }
    cout<<ans<<'\n';

}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 1

Verdict: ACCEPTED

Test 8

Group: 1

Verdict: ACCEPTED

Test 9

Group: 1

Verdict: ACCEPTED

Test 10

Group: 1

Verdict: ACCEPTED

Test 11

Group: 1

Verdict: ACCEPTED

Test 12

Group: 1

Verdict: ACCEPTED

Test 13

Group: 1

Verdict: ACCEPTED

Test 14

Group: 1

Verdict: ACCEPTED

Test 15

Group: 1

Verdict: ACCEPTED

Test 16

Group: 1

Verdict: ACCEPTED

Test 17

Group: 1

Verdict: ACCEPTED

Test 18

Group: 1

Verdict: ACCEPTED

Test 19

Group: 1

Verdict: ACCEPTED

Test 20

Group: 1

Verdict: ACCEPTED

Test 21

Group: 1

Verdict: ACCEPTED

Test 22

Group: 1

Verdict: ACCEPTED

Test 23

Group: 2

Verdict: ACCEPTED

Test 24

Group: 2

Verdict: ACCEPTED

Test 25

Group: 2

Verdict: ACCEPTED

Test 26

Group: 2

Verdict: ACCEPTED

Test 27

Group: 2

Verdict: ACCEPTED

Test 28

Group: 2

Verdict: ACCEPTED

Test 29

Group: 2

Verdict: ACCEPTED

Test 30

Group: 2

Verdict: ACCEPTED

Test 31

Group: 2

Verdict: WRONG ANSWER

Test 32

Group: 2

Verdict: ACCEPTED

Test 33

Group: 2

Verdict: ACCEPTED

Test 34

Group: 2

Verdict: ACCEPTED

Test 35

Group: 2

Verdict: WRONG ANSWER

Test 36

Group: 2

Verdict: ACCEPTED

Test 37

Group: 2

Verdict: ACCEPTED

Test 38

Group: 2

Verdict: ACCEPTED

Test 39

Group: 2

Verdict: WRONG ANSWER

Test 40

Group: 2

Verdict: ACCEPTED

Test 41

Group: 2

Verdict: ACCEPTED

Test 42

Group: 2

Verdict: ACCEPTED

Test 43

Group: 2

Verdict: ACCEPTED

Test 44

Group: 2

Verdict: ACCEPTED

Test 45

Group: 3

Verdict: WRONG ANSWER

Test 46

Group: 3

Verdict: ACCEPTED

Test 47

Group: 3

Verdict: ACCEPTED

Test 48

Group: 3

Verdict: ACCEPTED

Test 49

Group: 3

Verdict: ACCEPTED

Test 50

Group: 3

Verdict: WRONG ANSWER

Test 51

Group: 3

Verdict: WRONG ANSWER

Test 52

Group: 3

Verdict: WRONG ANSWER

Test 53

Group: 3

Verdict: WRONG ANSWER

Test 54

Group: 3

Verdict: ACCEPTED

Test 55

Group: 3

Verdict: WRONG ANSWER

Test 56

Group: 3

Verdict: ACCEPTED

Test 57

Group: 3

Verdict: ACCEPTED

Test 58

Group: 3

Verdict: WRONG ANSWER

Test 59

Group: 3

Verdict: ACCEPTED

Test 60

Group: 3

Verdict: WRONG ANSWER

Test 61

Group: 3

Verdict: ACCEPTED

Test 62

Group: 3

Verdict: ACCEPTED

Test 63

Group: 3

Verdict: WRONG ANSWER

Test 64

Group: 3

Verdict: WRONG ANSWER

Test 65

Group: 3

Verdict: ACCEPTED

Test 66

Group: 3

Verdict: ACCEPTED