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Submission #971940

# Submission time Handle Problem Language Result Execution time Memory
971940 2024-04-29T14:13:15 Z vjudge1 XORanges (eJOI19_xoranges) C++17
100 / 100
 108 ms 9608 KB 
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
const int N = 2e5 + 5;
int a[N], n, q;
ll bit[2][N];
void upd(int x, int i, ll val){
	for(++i; i<N; i+=i&-i) bit[x][i] ^= val;
}
ll qry(int x, int i){
	ll res = 0; for(++i; i; i-=i&-i) res ^= bit[x][i]; return res;
}
ll sum(int x, int l, int r){
	return qry(x, r) ^ qry(x, l-1);
}
signed main(){
	scanf("%d %d", &n, &q);
	for(int i = 0; i<n; ++i) scanf("%d", a+i);
	for(int i = 0; i<n; ++i){
		upd(i&1, i>>1, a[i]);
	}
	while(q--){
		int t; scanf("%d", &t);
		if(t == 1){
			int i, val; scanf("%d %d", &i, &val); --i;
			upd(i&1, i>>1, val ^ a[i]);
			a[i] = val;
		}else if(t == 2){
			int l, r; scanf("%d %d", &l, &r); --l; --r;
			ll T = 0;
			if((r-l+1)&1){
				if(!(l&1)){
					int R = r;
					if(R&1) --R;
					T = sum(0, l>>1, R>>1);
				}else if(l&1){
					int R = r;
					if(!(R&1)) --R;
					T = sum(1, l>>1, R>>1);
				}
			}	
			printf("%lld\n", T);
		}
	}
}

Compilation message

xoranges.cpp: In function 'int main()':
xoranges.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |  scanf("%d %d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~~
xoranges.cpp:18:32: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |  for(int i = 0; i<n; ++i) scanf("%d", a+i);
      |                           ~~~~~^~~~~~~~~~~
xoranges.cpp:23:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |   int t; scanf("%d", &t);
      |          ~~~~~^~~~~~~~~~
xoranges.cpp:25:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |    int i, val; scanf("%d %d", &i, &val); --i;
      |                ~~~~~^~~~~~~~~~~~~~~~~~~
xoranges.cpp:29:19: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |    int l, r; scanf("%d %d", &l, &r); --l; --r;
      |              ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 3 ms 2612 KB Output is correct
12 Correct 2 ms 2652 KB Output is correct
13 Correct 3 ms 2652 KB Output is correct
14 Correct 3 ms 2652 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 108 ms 4692 KB Output is correct
2 Correct 86 ms 9552 KB Output is correct
3 Correct 86 ms 9608 KB Output is correct
4 Correct 94 ms 9128 KB Output is correct
5 Correct 85 ms 9156 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 3 ms 2612 KB Output is correct
12 Correct 2 ms 2652 KB Output is correct
13 Correct 3 ms 2652 KB Output is correct
14 Correct 3 ms 2652 KB Output is correct
15 Correct 108 ms 4692 KB Output is correct
16 Correct 86 ms 9552 KB Output is correct
17 Correct 86 ms 9608 KB Output is correct
18 Correct 94 ms 9128 KB Output is correct
19 Correct 85 ms 9156 KB Output is correct
20 Correct 80 ms 9300 KB Output is correct
21 Correct 81 ms 9296 KB Output is correct
22 Correct 83 ms 9300 KB Output is correct
23 Correct 98 ms 9452 KB Output is correct
24 Correct 84 ms 9140 KB Output is correct