Submission #1281766

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281766		InvMOD	Lamps (JOI19_lamps)	C++17	4 / 100	13 ms	6388 KiB

lamp

#include<bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define pb push_back
#define eb emplace_back

#define vi vector<int>
#define pi pair<int,int>
#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())

template<class T> using upq = priority_queue<T, vector<T>, greater<T>>;
template<class T> int lwrbound(const vector<T>& a, const T& b, const int s = 0){return int(lower_bound(s + all(a), b) - a.begin());}
template<class T> int uprbound(const vector<T>& a, const T& b, const int s = 0){return int(upper_bound(s + all(a), b) - a.begin());}

#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define ROF(i, a, b) for(int i = (a); i >= (b); i--)
#define sumof(x) accumulate(all(x), 0ll)
#define dbg(x) "[" << #x " = " << (x) << "]"
#define el "\n"

using ll = long long;
using ld = long double;

template<class T> bool ckmx(T& a, const T b){return (a < b ? a = b, true : false);}
template<class T> bool ckmn(T& a, const T b){return (a > b ? a = b, true : false);}


void Main()
{
    int n; cin >> n;

    string A, B; cin >> A >> B;

    A = " " + A;
    B = " " + B;

    vi dp(n + 1), sMn(3, 0), id(3, 0);

    FOR(i, 1, n){
        id[0] += B[i - 1] != '0' && B[i] == '0';
        id[1] += B[i - 1] != '1' && B[i] == '1';
        id[2] += B[i - 1] == A[i - 1] && B[i] != A[i];

        dp[i] = 1e9;
        FOR(j, 0, 2){
            ckmn(dp[i], id[j] + sMn[j] + (j < 2));
        }

        if(i < n){
            ckmn(sMn[0], dp[i] - (id[0] - (B[i + 1] == '0')));
            ckmn(sMn[1], dp[i] - (id[1] - (B[i + 1] == '1')));
            ckmn(sMn[2], dp[i] - (id[2] - (B[i + 1] != A[i + 1])));
        }
    }
    cout << dp[n] << el;
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP", "r", stdin);
        freopen(name".OUT", "w", stdout);
    }

    int t = 1; while(t--) Main();
    return 0;
}

Compilation message (stderr)

lamp.cpp: In function 'int32_t main()':
lamp.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(name".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
lamp.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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