Submission #1260970

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260970		icebear	Cats or Dogs (JOI18_catdog)	C++20	Compilation error	0 ms	0 KiB

catdog

// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 1e5 + 5;
int n, q;
vector<int> G[N];
int f[N][3], state[N];

void initialize(int N, vector<int> A, vector<int> B) {
    n = N;
    FOR(i, 0, N - 2) {
        G[A[i]].pb(B[i]);
        G[B[i]].pb(A[i]);
    }
}

void dfs(int u, int par) {
    if (state[u] == 0) f[u][1] = f[u][2] = 0;
    else f[u][state[u]] = 0;
    for(int v : G[u]) if (v != par) {
        dfs(v, u);
        f[u][1] += min(f[v][1], f[v][2] + 1);
        f[u][2] += min(f[v][2], f[v][1] + 1);
    }
}

int cat(int v) {
    state[v] = 1;
    memset(f, 0x3f, sizeof f);
    dfs(1, -1);
    return min(f[1][1], f[1][2]);
}

int dog(int v) {
    state[v] = 2;
    memset(f, 0x3f, sizeof f);
    dfs(1, -1);
    return min(f[1][1], f[1][2]);
}

int neighbor(int v) {
    state[v] = 0;
    memset(f, 0x3f, sizeof f);
    dfs(1, -1);
    return min(f[1][1], f[1][2]);
}

//void init(void) {
//    initialize(n, A, B);
//}

void process(void) {
    cin >> n;
    FOR(i, 2, n) {
        int u, v;
        cin >> u >> v;
        G[u].pb(v);
        G[v].pb(u);
    }
    cin >> q;
    while(q--) {
        int t, v;
        cin >> t >> v;
        if (t == 1) cout << cat(v) << '\n';
        else if (t == 2) cout << dog(v) << '\n';
        else cout << neighbor(v) << '\n';
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
//        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

catdog.cpp: In function 'int main()':
catdog.cpp:107:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
catdog.cpp:108:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/cc2gf9ED.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccYUPyjk.o:catdog.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status