Submission #966222

#	Time	Username	Problem	Language	Result	Execution time	Memory
966222		vjudge1	XORanges (eJOI19_xoranges)	C++17	30 / 100	1071 ms	7396 KiB

xoranges

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

#define ff(i, a, b) for(auto i=(a); i<=(b); ++i)
#define ffr(i, b, a) for(auto i=(b); i>=(a); --i)
#define nl "\n"
#define ss " "
#define sz size()
#define pb emplace_back
#define pf push_front
#define fi first
#define se second
#define ms(a,x) memset(a, x, sizeof (a))
#define re exit(0)

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pair<int, int> > vpii;
typedef vector<pair<ll, ll> > vpll;

const ll mod=1e9+7, maxn=3e5+5, inf=1e18;

void rf(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    if(fopen("o.inp","r")){
        freopen("o.inp","r",stdin); freopen("o.out","w",stdout);
    }
}

int n, q, a[maxn], f[5005][5005];

int main()
{
    rf();
    cin>>n>>q;
    ff(i, 1, n) cin>>a[i];
    ff(i, 1, n) ff(j, i, n) ff(k, i, j) f[i][j]^=a[k];
    while(q--)
    {
        int op, l, r; cin>>op>>l>>r;
        if(op==1) a[l]=r;
        else
        {
            if(n<=100)
            {
                int ans=0;
                ff(i, l, r) ff(j, i, r) ff(k, i, j) ans^=a[k];
                cout<<ans<<nl;
            }
            else if(n<=500)
            {
                int ans=0;
                ff(i, l, r) ff(j, i, r) ans^=f[i][j];
                cout<<ans<<nl;
            }
        }
    }
    re;
}

Compilation message (stderr)

xoranges.cpp: In function 'void rf()':
xoranges.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen("o.inp","r",stdin); freopen("o.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
xoranges.cpp:32:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen("o.inp","r",stdin); freopen("o.out","w",stdout);
      |                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 0 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25