Submission #1217429

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217429		hainam2k9	Snake Escaping (JOI18_snake_escaping)	C++20	0 / 100	1 ms	320 KiB

snake_escaping

#include <bits/stdc++.h>
#define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0)
#define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define db long double
#define sz(a) ((int)(a).size())
#define pb emplace_back
#define pf emplace_front
#define pob pop_back
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define ins emplace
#define mp make_pair
using namespace std;
const int MOD = 1e9+7, MAXN = 2e6+5;
const string NAME = "";
int n,q,a[MAXN],sub[MAXN],sup[MAXN];
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n >> q;
    for(int i = 0; i<(1<<n); ++i){
        char c;
        cin >> c;
        a[i]=c-48;
        sub[i]=sup[i]=a[i];
    }
    for(int i = 0; i<n; ++i)
        for(int mask = 0; mask<(1<<n); ++mask){
            if((mask>>i)&1) sub[mask]+=sub[mask^(1<<i)];
            else sup[mask]+=sup[mask^(1<<i)];
        }
    while(q--){
        int maskQ=0,mask1=0,mask0=0,rs=0;
        int cnt[3]={0,0,0};
        for(int i = n-1; i>=0; --i){
            char c;
            cin >> c;
            if(c=='0') mask0|=1<<i, ++cnt[0];
            else if(c=='1') mask1|=1<<i, ++cnt[1];
            else maskQ|=1<<i, ++cnt[2];
        }
        if(cnt[2]==min({cnt[0],cnt[1],cnt[2]})){
            for(int mask = maskQ; ; mask=(mask-1)&maskQ){
                rs+=a[mask|mask1];
                if(mask==0) break;
            }
        }else if(cnt[1]==min(cnt[1],cnt[2])){
            rs=sub[mask1|maskQ];
            for(int mask = (mask1-1)&mask1; mask>0; mask=(mask-1)&mask1)
                rs-=sub[mask|maskQ];
            if(mask1>0) rs-=sub[maskQ];
        }else{
            rs=sup[mask1];
            for(int mask = mask0; mask>0; mask=(mask-1)&mask0)
                rs-=sup[mask|mask1];
        }
        cout << rs << "\n";
    }
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:26:45: note: in expansion of macro 'fo'
   26 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
snake_escaping.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:26:45: note: in expansion of macro 'fo'
   26 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

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