Submission #972600

#	Time	Username	Problem	Language	Result	Execution time	Memory
972600		njoop	XORanges (eJOI19_xoranges)	C++14	Compilation error	0 ms	0 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

int n, q, od[600010], ev[600010], c, id, va, in, st, en, f, s, enu, onu;

void update(int l, int r, int idx, int val, int node, int (&seg)[400010]) {
    if(l == r) {
        seg[node] = val;
        return;
    }
    int mid = (l+r)>>1;
    if(idx <= mid) update(l, mid, idx, val, node*2, seg);
    else update(mid+1, r, idx, val, node*2+1, seg);
    seg[node] = seg[node*2]^seg[node*2+1];
}

int query(int l, int r, int ql, int qr, int node, int (&seg)[400010]) {
    if(l > qr || r < ql) return 0;
    if(l >= ql && r <= qr) return seg[node];
    int mid = (l+r)>>1;
    return query(l, mid, ql, qr, node*2, seg)^query(mid+1, r, ql, qr, node*2+1, seg);
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> q;
    for(int i=1; i<=n; i++) {
        cin >> in;
        if(i%2) {
            update(1, n, i, in, 1, od);
        } else {
            update(1, n, i, in, 1, ev);
        }
    }
    while(q--) {
        cin >> c;
        if(c == 1) {
            cin >> id >> va;
            if(id%2 == 0) update(1, n, id, va, 1, ev);
            else update(1, n, id, va, 1, od);
        } else {
            cin >> st >> en;
            if((en-st)%2) cout << 0 << "\n";
            else if(st%2) {
                cout << query(1, n, st, en, 1, od) << "\n";
            } else {
                cout << query(1, n, st, en, 1, ev) << "\n";
            }
        }
    }
    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:31:36: error: invalid initialization of reference of type 'int (&)[400010]' from expression of type 'int [600010]'
   31 |             update(1, n, i, in, 1, od);
      |                                    ^~
xoranges.cpp:7:61: note: in passing argument 6 of 'void update(int, int, int, int, int, int (&)[400010])'
    7 | void update(int l, int r, int idx, int val, int node, int (&seg)[400010]) {
      |                                                       ~~~~~~^~~~~~~~~~~~
xoranges.cpp:33:36: error: invalid initialization of reference of type 'int (&)[400010]' from expression of type 'int [600010]'
   33 |             update(1, n, i, in, 1, ev);
      |                                    ^~
xoranges.cpp:7:61: note: in passing argument 6 of 'void update(int, int, int, int, int, int (&)[400010])'
    7 | void update(int l, int r, int idx, int val, int node, int (&seg)[400010]) {
      |                                                       ~~~~~~^~~~~~~~~~~~
xoranges.cpp:40:51: error: invalid initialization of reference of type 'int (&)[400010]' from expression of type 'int [600010]'
   40 |             if(id%2 == 0) update(1, n, id, va, 1, ev);
      |                                                   ^~
xoranges.cpp:7:61: note: in passing argument 6 of 'void update(int, int, int, int, int, int (&)[400010])'
    7 | void update(int l, int r, int idx, int val, int node, int (&seg)[400010]) {
      |                                                       ~~~~~~^~~~~~~~~~~~
xoranges.cpp:41:42: error: invalid initialization of reference of type 'int (&)[400010]' from expression of type 'int [600010]'
   41 |             else update(1, n, id, va, 1, od);
      |                                          ^~
xoranges.cpp:7:61: note: in passing argument 6 of 'void update(int, int, int, int, int, int (&)[400010])'
    7 | void update(int l, int r, int idx, int val, int node, int (&seg)[400010]) {
      |                                                       ~~~~~~^~~~~~~~~~~~
xoranges.cpp:46:48: error: invalid initialization of reference of type 'int (&)[400010]' from expression of type 'int [600010]'
   46 |                 cout << query(1, n, st, en, 1, od) << "\n";
      |                                                ^~
xoranges.cpp:18:57: note: in passing argument 6 of 'int query(int, int, int, int, int, int (&)[400010])'
   18 | int query(int l, int r, int ql, int qr, int node, int (&seg)[400010]) {
      |                                                   ~~~~~~^~~~~~~~~~~~
xoranges.cpp:48:48: error: invalid initialization of reference of type 'int (&)[400010]' from expression of type 'int [600010]'
   48 |                 cout << query(1, n, st, en, 1, ev) << "\n";
      |                                                ^~
xoranges.cpp:18:57: note: in passing argument 6 of 'int query(int, int, int, int, int, int (&)[400010])'
   18 | int query(int l, int r, int ql, int qr, int node, int (&seg)[400010]) {
      |                                                   ~~~~~~^~~~~~~~~~~~