Submission #964573

#	Time	Username	Problem	Language	Result	Execution time	Memory
964573		onebit1024	Snake Escaping (JOI18_snake_escaping)	C++17	5 / 100	2047 ms	15420 KiB

snake_escaping

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pb push_back
#define all(c) c.begin(), c.end()
#define endl "\n"

const double PI=3.141592653589;


void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define dbg(x...) cerr << "LINE(" << __LINE__ << ") -> " <<"[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif


int n,q;
vector<int>pref;
int solve(int l, int r, const string &s, int k){
    int m = (l+r)/2;
    if(s[k]=='0')r = m;
    else if(s[k]=='1')l = m+1;
    if(k==0)return pref[r]  - (l==0?0:pref[l-1]);

    if(s[k]!='?')return solve(l,r,s,k-1);
    else return solve(l,m,s,k-1) + solve(m+1, r, s,k-1);
}
void solve()
{
    cin >> n >> q;
    int t = (1ll<<n);
    string s;cin >> s;
    pref = vector<int>(t+1);
    pref[0] = s[0]-'0';
    for(int i = 1;i<t;++i)pref[i] = pref[i-1] + (s[i]-'0');
    while(q--){
        string s;cin >> s;
        reverse(all(s));
        cout << solve(0,t-1,s,n-1) << endl;
    }
}   

int32_t main()
{

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);


    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    

    int T=1;
    for(int i = 1;i<=T;++i)
    {
        // cout << "Case #" << i << ": ";
        solve();
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 10
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25