Submission #445617

#	Time	Username	Problem	Language	Result	Execution time	Memory
445617		aris12345678	XORanges (eJOI19_xoranges)	C++14	75 / 100	1077 ms	4140 KiB

xoranges

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

const int mxN = 2*1e5+5;
int a[mxN], pref[mxN];

int main() {
    int n, q;
    scanf("%d %d", &n, &q);
    for(int i = 0; i < n; i++) {
        scanf("%d", &a[i]);
        if(i == 0 || i == 1)
            pref[i+1] = a[i];
        else
            pref[i+1] = a[i]^pref[i-1];
    }
    while(q--) {
        int type, l, r;
        scanf("%d %d %d", &type, &l, &r);
        if(type == 1) {
            a[l-1] = r;
            for(int i = 0; i < n; i++) {
                if(i == 0 || i == 1)
                    pref[i+1] = a[i];
                else    
                    pref[i+1] = a[i]^pref[i-1];
            }
        } else {
            if(l%2 != r%2)
                printf("0\n");
            else
                printf("%d\n", pref[r]^pref[l]^a[l-1]);
        }
    }
    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d %d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
xoranges.cpp:11:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
xoranges.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         scanf("%d %d %d", &type, &l, &r);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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