Submission #1048980

#	Time	Username	Problem	Language	Result	Execution time	Memory
1048980		Nickpapadak	XORanges (eJOI19_xoranges)	C++14	75 / 100	1040 ms	6128 KiB

xoranges

#include<bits/stdc++.h>
using namespace std;
const unsigned int MAXN = 2e+5 + 10;
bool mp[MAXN];
int pf[MAXN], pf1[MAXN],pf2[MAXN], a[MAXN];
int N, Q;
int main(){
    scanf("%d%d",&N,&Q);
    // mp.resize(N+1, 0);
    for(int i = 1; i<=N;++i){
        scanf("%d",&a[i]);
        pf[i] = pf[i-1] ^ a[i];
        // mp[i] = 0;
    }
    pf1[1] = a[1];
    for(int i = 3; i<=N; i+=2){
        pf1[i] = pf1[i-2] ^ a[i];
    }
    for(int i = 2; i<=N; i+=2){
        pf2[i] = pf2[i-2] ^ a[i];
    }
    while(Q--){
        int s,b, type;
        scanf("%d%d%d", &type, &s, &b);
        if(type == 2){
            int ans = 0;
            // for(int i = 1; i <= b-s+1; ++i){
                // for(int j = s; j+i-1 <= b;++j){
                    // ans ^= (pf[j+i-1] ^ pf[j-1]);
                //     // changemp(j+i-1);
                //     // changemp(j+i-1);
                //     for(int k = j; k <= j+i-1; ++k) mp[k] = !mp[k];
                //     // mp[j+i-1] = !mp[j+i-1];
                //     // mp[j-1] = !mp[j-1];
                // }
            // }
            if((b-s+1) % 2 == 1){
                if(s % 2 == 1) ans = pf1[b] ^ pf1[max(s-2,0)];
                else           ans = pf2[b] ^ pf2[max(s-2,0)];
            }
            // for(int i = 1; i<=N;++i){
                // printf("[%d]", i);
            // }
            // printf("\n");
            // for(int i = 1; i<=N;++i){
                // printf(" %d ", mp[i]);
                // mp[i] = 0;
            // }
            // printf("\n");
            printf("%d\n", ans);
        // }
        }else{
            a[s] = b;
            pf1[1] = a[1];
            for(int i = 3; i<=N; i+=2){
                pf1[i] = pf1[i-2] ^ a[i];
            }
            for(int i = 2; i<=N; i+=2){
                pf2[i] = pf2[i-2] ^ a[i];
            }
        }
        //     for(int i = s; i<=N;++i){
        //         pf[i] = pf[i-1] ^ a[i];
        //     }
        // }
    }
    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     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:24:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         scanf("%d%d%d", &type, &s, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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