Submission #1094863

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094863		cpptowin	Snake Escaping (JOI18_snake_escaping)	C++17	22 / 100	616 ms	49280 KiB

snake_escaping

#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define int long long
#define inf (int)1e18
#define bitcount(x) __builtin_popcountll(x)
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
#define ss(x) (int)x.size()
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
const int nsqrt = 450;
const int mod = 1e9 + 7;
void add(int &x, int k)
{
    x += k;
    x %= mod;
    if(x < 0) x += mod;
}
void del(int &x, int k)
{
    x -= k;
    x %= mod;
    if(x < 0) x += mod;
}
vi aa,bb,cc;
int n,q,a[maxn],sub[maxn],super[maxn];
main()
{
#define name "TASK"
    if (fopen(name ".inp", "r"))
    {
        freopen(name ".inp", "r", stdin);
        freopen(name ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> q;
    int m = (1 << n) - 1;
    fo(i,0,m)
    {
        char t;
        cin >> t;
        a[i] = t - '0';
        sub[i] = a[i];
        super[i] = a[i];
    }
    fo(i,0,n - 1) fod(mask,m,0) if(!bit(mask,i)) super[mask] += super[offbit(mask,i)];
    fo(i,0,n - 1) fo(mask,0,m) if(bit(mask,i)) sub[mask] += sub[offbit(mask,i)];
    while(q--)
    {
        string s;
        cin >> s;
        reverse(all(s));
        aa.clear();
        bb.clear();
        cc.clear();
        fo(i,0,ss(s) - 1) 
        {
            if(s[i] == '0') aa.pb(i);
            else if(s[i] == '1') bb.pb(i);
            else if(s[i] == '?') cc.pb(i);
        }
        int ans = 0;
        if(ss(cc) <= 6)
        {
            int vv = 0;
            for(int it : bb) vv = onbit(vv,it);
            fo(mask,0,(1 << ss(cc)) - 1)
            {
                int v1 = vv;
                fo(i,0,ss(cc) - 1) if(bit(mask,i)) 
                {
                    v1 = onbit(v1,cc[i]);
                }
                ans += a[v1];
            }
        }
        else if(ss(aa) <= 6)
        {
            int vv = 0;
            for(int it : bb) vv = onbit(vv,it);
            fo(mask,0,(1 << ss(aa)) - 1)
            {
                int v1 = vv;
                fo(i,0,ss(aa) - 1) if(bit(mask,i))
                {
                    v1 = onbit(v1,aa[i]);
                }
                if(bitcount(mask) & 1) ans -= super[v1];
                else ans += super[v1];
            }
        }
        else if(ss(bb) <= 6)
        {
            int vv = 0;
            for(int it : cc) vv = onbit(vv,it);
            fo(mask,0,(1 << ss(bb)) - 1)
            {
                int v1 = vv;
                fo(i,0,ss(bb) - 1) if(bit(mask,i))
                {
                    v1 = onbit(v1,bb[i]);
                }
                if(bitcount(mask) % 2 == ss(bb) % 2) ans += sub[v1];
                else ans -= sub[v1];
            }
        }
        cout << ans;en;
    }
}

Compilation message (stderr)

snake_escaping.cpp:59:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   59 | main()
      | ^~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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