제출 #1118468

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1118468		vjudge1	Lamps (JOI19_lamps)	C++17	0 / 100	24 ms	10492 KiB

lamp

#include <bits/stdc++.h>

using namespace std;

#define TASK "Lamps"
#define REP(i, n) for(int i = 1; i <= n; i++)
#define FOR(i, a, b) for(auto i = a; i <= b; i++)
#define FORD(i, a, b) for(auto i = a; i >= b; i--)
template<class T> bool maximize(T& a, T b) { if(a < b) return a = b, 1; return 0; }
template<class T> bool minimize(T& a, T b) { if(a > b) return a = b, 1; return 0; }

using ii = pair<int, int>;
#define fi first
#define se second
const int N = (int)1e6 + 7;
using Bit = bitset<N>;
vector<ii> save;
Bit a, b;
int n;
int dp[N], lst[N];

void Read()
{
    cin >> n >> a >> b;
}

void Solve()
{
    Bit c = ~(a ^ b);
    cout << a << endl << b << endl << c << endl;
    n--;
    int l = 0;
    bool isFill = c[0];
    REP(i, n)
    {
        if(!c[i])
            isFill = 0;
        if(!isFill && b[i] != b[i - 1])
        {
            save.push_back({l, i - 1});
            l = i;
            isFill = c[i];
        }
    }
    if(l != n)
        save.push_back({l, n});
    l = 0;
    FOR(i, 0, n)
    {
        if(i > 0 && c[i] && !c[i - 1])
            save.push_back({l, i - 1});
        if(c[i])
            l = i + 1;
    }
    if(!c[n])
        save.push_back({l, n});
    sort(save.begin(), save.end(), [&] (const ii& u, const ii& v)
        {
            return u.se < v.se || (u.se == v.se && u.fi < v.fi);
        }
    );
    memset(dp, 0x3f, sizeof dp);
//    dp[0] = 0;
    FOR(i, 1, n)
    {
        if(!c[i - 1])
            lst[i] = i - 1;
        else
            lst[i] = lst[i - 1];
//        cout << i << ' ' << lst[i] << endl;
    }
    for(auto [L, R] : save)
    {
//        cout << lst[L] << ' ' << L << ' ' << R << endl;
        if(L == 0)
            dp[R] = 1;
        else
            minimize(dp[R], dp[lst[L]] + 1);
    }
//    cout << N - c.count() << endl;
    cout << dp[n] << endl;
}

signed main()
{
    cin.tie(0)->ios_base::sync_with_stdio(0);

    if(fopen("TASK.INP", "r")) freopen("TASK.INP", "r", stdin);
    if(fopen(TASK".INP", "r")) {
        freopen(TASK".INP", "r", stdin);
        freopen(TASK".OUT", "w", stdout);
    }

    Read();
    Solve();

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

lamp.cpp: In function 'int main()':
lamp.cpp:88:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |     if(fopen("TASK.INP", "r")) freopen("TASK.INP", "r", stdin);
      |                                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
lamp.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
lamp.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen(TASK".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 4
• Subtask 4: 0 / 49