제출 #1166805

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1166805		icebear	9월 (APIO24_september)	C++20	컴파일 에러	0 ms	0 KiB

september

// ~~ icebear love attttt ~~
#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 "icebearat"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int MAX = 2e5 + 5;
int L[MAX], R[MAX];
vector<int> G[MAX];
int range[MAX], dp[MAX];

void dfs(int u, int par) {
    for(int v : G[u]) if (v != par) {
        dfs(v, u);
        minimize(L[u], L[v]);
        maximize(R[u], R[v]);
    }
}

int solve(int N, int M, vector<int> F, vector<vector<int>> S) {
    REP(i, N) if (i > 0) {
        G[i + 1].pb(F[i] + 1);
        G[F[i] + 1].pb(i + 1);
    }

    FOR(i, 1, N) L[i] = range[i] = inf, R[i] = -inf;
    REP(i, M) REP(j, N - 1) {
        minimize(L[S[i][j] + 1], j + 1);
        maximize(R[S[i][j] + 1], j + 1);
    }

    dfs(1, -1);
    FOR(i, 2, N) minimize(range[R[i]], L[i]);
    FOR(i, 1, N - 1) {
        dp[i] = dp[i - 1];
        if (range[i] != inf)
            maximize(dp[i], dp[range[i] - 1] + 1);
    }

    return dp[N - 1];
}

void init(void) {}
void process(void) {
    cout << solve(3, 1, {-1, 0, 0}, {{1, 2}}) << endl;
    cout << solve(5, 2, {-1, 0, 0, 1, 1}, {{1, 2, 3, 4}, {4, 1, 2, 3}}) << endl;
}

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;
}

컴파일 시 표준 에러 (stderr) 메시지

september.cpp: In function 'int main()':
september.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
september.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccYhFJiY.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc2njr4k.o:september.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status