Submission #1297350

#	Time	Username	Problem	Language	Result	Execution time	Memory
1297350		kqhuy2009	Selling RNA Strands (JOI16_selling_rna)	C++20	10 / 100	1586 ms	34176 KiB

selling_rna

#include <bits/stdc++.h>
#define ll long long
#define INF (ll)1e18+1
#define bit(mask, id) ((mask >> id) & 1LL)
#define pb push_back
#define el '\n'
#define ft first
#define sc second
#define ii pair<ll,ll>
#define FOR(i, l, r) for (int i = (l); i <= (r); ++i)
#define FORD(i, l, r) for(int i = (l); i >= (r); --i)
#define str string
#define all(a,i) memset(a,i,sizeof(a))
#define al(a) a.begin(),a.end()
/////////////////////////////

const long long oo = 1e18;
const int N = 1e6 + 9;

using namespace std;

bool prefix(str s, str t)
{
    if(t.size()>s.size()) return false;
    FOR(i,0,t.size()-1)
    {
        if(t[i]!=s[i]) return false;
    }
    return true;
}
bool suffix(str s, str t)
{
    reverse(s.begin(),s.end());
    reverse(t.begin(),t.end());
    return prefix(s,t);
}
ll n, Q;
str a[N];
signed main()
{
    #define TASK "rna"
    if(fopen(TASK ".inp","r")) {
        freopen (TASK ".inp","r",stdin);
        //freopen (TASK ".out","w",stdout);
        freopen (TASK ".ans","w",stdout);
    }

    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>Q;
    FOR(i,1,n) cin>>a[i];
    FOR(i,1,Q)
    {
        str p,q; cin>>p>>q;
        ll cnt = 0;
        FOR(j,1,n)
        {
            if(prefix(a[j],p) && suffix(a[j],q)) cnt++;
        }
        cout<<cnt<<el;
    }

    return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:43:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |         freopen (TASK ".inp","r",stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
selling_rna.cpp:45:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen (TASK ".ans","w",stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 40