제출 #958658

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
958658		Yang8on	Lamps (JOI19_lamps)	C++14	0 / 100	1080 ms	16016 KiB

lamp

#include <bits/stdc++.h>
#define Y8o "lamps"
#define maxn 1000005
#define ll long long
#define pii pair<int, int>
#define gb(i, j) ((i >> j) & 1)

using namespace std;

/// okay?
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll GetRandom(ll l, ll r) {
    return uniform_int_distribution<ll> (l, r) (rng);
}
void iof() { /// ------------------inp_out file!-----------------///
    if(fopen(Y8o".inp", "r"))
    {
        freopen(Y8o".inp", "r", stdin);
//        freopen(Y8o".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void ctime() { /// ------------------check time!-----------------///
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}
/// okay!

int n;
int demt[maxn], dp[maxn], dem0[maxn];
string s1, s2;

void solve()
{
    cin >> n;
    cin >> s1 >> s2, s1 = ' ' + s1, s2 = ' ' + s2;

    for(int i = 1; i <= n; i ++)
    {
        demt[i] = demt[i - 1] + (s1[i] == s2[i]);
        dem0[i] = dem0[i - 1] + (s2[i] == '0');
        dp[i] = 1e9;
    }

    for(int i = 1; i <= n; i ++)
    {
        for(int j = 0; j <= i - 1; j ++)
        {
            /// TH1 : giongnhau
            if(demt[i] - demt[j] == i - j) dp[i] = dp[j];
            else
            {
                int slans0 = dem0[i] - dem0[j];
                int slans1 = (i - j) - slans0;

                int same = demt[i] - demt[j];

                dp[i] = min(dp[i], dp[j] + 1 + slans1); /// off then turn some lamps
                dp[i] = min(dp[i], dp[j] + 1 + slans0); /// on then off sonme lamps
                dp[i] = min(dp[i], dp[j] + same + 1); /// togle
            }
        }
    }

    cout << dp[n];
}


int main()
{
    iof();

    int nTest = 1;
//    cin >> nTest;

    while(nTest --) {
        solve();
    }

    ctime();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

lamp.cpp: In function 'void iof()':
lamp.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen(Y8o".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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