Submission #1138488

#	Time	Username	Problem	Language	Result	Execution time	Memory
1138488		SmuggingSpun	Sterilizing Spray (JOI15_sterilizing)	C++20	10 / 100	24 ms	2120 KiB

sterilizing

#include<bits/stdc++.h>
#define taskname "B"
using namespace std;
typedef long long ll;
const int lim = 1e5 + 5;
int n, q, k, a[lim];
ll bit[lim];
void update(int p, int x){
	for(; p <= n; p += p & -p){
		bit[p] += x;
	}
}
ll get(int p){
	ll ans = 0;
	for(; p > 0; p -= p & -p){
		ans += bit[p];
	}
	return ans;
}
namespace sub3{
	void solve(){
		for(int _ = 0; _ < q; _++){
			int _t, u, v;
			cin >> _t >> u >> v;
			if(_t == 1){
				update(u, -a[u]);
				update(u, a[u] = v);
			}
			else if(_t == 3){
				cout << get(v) - get(u - 1) << "\n";
			}
		}
	}
}
namespace sub124{
	void solve(){
		
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n >> q >> k;
	memset(bit, 0, sizeof(bit));
	for(int i = 1; i <= n; i++){
		cin >> a[i];
		update(i, a[i]);
	}
	if(k == 1){
		sub3::solve();
	}
	else{
		sub124::solve();
	}
}

Compilation message (stderr)

sterilizing.cpp: In function 'int main()':
sterilizing.cpp:43:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75