제출 #1274592

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1274592		icebear	Flooding Wall (BOI24_wall)	C++20	70 / 100	5093 ms	16104 KiB

Main

// ~~ 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 "gen"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 5e5 + 5;
int n, a[N], b[N], w[N], pref[N], suff[N], power2[N];

void init(void) {
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 1, n) cin >> b[i];
}

void process(void) {
    power2[0] = 1;
    FOR(i, 1, n) power2[i] = 1LL * power2[i - 1] * 2 % MOD;

    vector<int> vals(1, 0);
    FOR(i, 1, n) {
        vals.pb(a[i]);
        vals.pb(b[i]);
    }
    sort(all(vals));
    vals.resize(unique(all(vals)) - vals.begin());

    int ans = 0;
    FOR(j, 1, (int)vals.size() - 1) {
        FOR(i, 1, n) w[i] = (a[i] < vals[j]) + (b[i] < vals[j]);
        pref[0] = suff[n + 1] = 1;
        FOR(i, 1, n) pref[i] = 1LL * pref[i - 1] * w[i] % MOD;
        FORR(i, n, 1) suff[i] = 1LL * suff[i + 1] * w[i] % MOD;

        int ways = 0;
        FOR(i, 2, n - 1)
            (ways += 1LL * (power2[i - 1] - pref[i - 1] + MOD) * (power2[n - i] - suff[i + 1] + MOD) % MOD * w[i] % MOD) %= MOD;
        (ans += 1LL * ways * (vals[j] - vals[j - 1]) % MOD) %= MOD;
    }
    cout << ans;
}

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

Main.cpp: In function 'int main()':
Main.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 17 / 17
• Subtask 3: 19 / 19
• Subtask 4: 14 / 14
• Subtask 5: 12 / 12
• Subtask 6: 0 / 30