Submission #894695

#	Time	Username	Problem	Language	Result	Execution time	Memory
894695		AgentPengin	역사적 조사 (JOI14_historical)	C++17	40 / 100	4049 ms	9172 KiB

historic

/**
 *    author:  AgentPengin ( Độc cô cầu bại )
 *    created: 23.12.2022 10:08:02
 *    too lazy to update time
**/
#pragma GCC optimize(3)
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse")
#pragma GCC target("avx","sse2")
#pragma GCC optimize("-fgcse-lm")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-ftree-pre")
#pragma GCC optimize("-ftree-vrp")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>

#define EL '\n'
#define fi first
#define se second
#define NAME "TASK"
#define ll long long
#define lcm(a,b) (a/gcd(a,b))*b
#define db(val) "["#val" = " << (val) << "] "
#define bend(v) (v).begin(),(v).end()
#define sz(v) (int)(v).size()
#define ex exit(0)

using namespace std;

const ll mod = 1e9 + 7;
const int inf = 0x1FFFFFFF;
const int MAXN = 1e5 + 5;
const int BLOCK_SIZE = 400;

struct Queries {
	int l,r,id;
} query[MAXN];

int n,a[MAXN],b[MAXN],c[MAXN],q,L = 1,R = 0;
vector<int> values;
ll st[MAXN << 2];
ll ans[MAXN];

void update(int pos,int val,int id = 1,int l = 0,int r = sz(values) -  1) {
	if (pos < l || pos > r) return;
	if (l == r) {
		st[id] += (ll)val;
		return;
	}
	int mid = l + r >> 1;
	if (pos <= mid) update(pos,val,id << 1,l,mid);
	else update(pos,val,id << 1 | 1,mid + 1,r);
	st[id] = max(st[id << 1],st[id << 1 | 1]);
}

signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if (ifstream(NAME".inp")) {
        freopen(NAME".inp","r",stdin);
        freopen(NAME".out","w",stdout);
    }
    cin >> n >> q;
    for (int i = 1;i <= n;i++) {
    	cin >> a[i];
		values.push_back(a[i]);    	
    }
    sort(bend(values));
	for (int i = 1;i <= n;i++) {
		b[i] = lower_bound(bend(values),a[i]) - values.begin();
		c[b[i]] = a[i];
	}
	for (int i = 1;i <=q ;i++) {
		cin >> query[i].l >> query[i].r;
		query[i].id = i;
	}
	sort(query + 1,query + q + 1,[&](const Queries& A,const Queries& B){
		if (A.l / BLOCK_SIZE != B.l / BLOCK_SIZE) return A.l / BLOCK_SIZE < B.l / BLOCK_SIZE;
		else return A.r < B.r;
	});
	for (int i = 1;i <= q;i++) {
		int l = query[i].l;
		int r = query[i].r;
		int id = query[i].id;
		while(L < l) {
			update(b[L],-values[b[L]]);
			++L;
		}
		while(L > l) {
			--L;
			update(b[L],+values[b[L]]);
		}
		while(R < r) {
			++R;
			update(b[R],+values[b[R]]);
		}
		while(R > r) {
			update(b[R],-values[b[R]]);
			--R;
		}
		
		
		ans[id] = st[1];
	}
	for (int i = 1;i <= q;i++) cout << ans[i] << EL;
	
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}
// agent pengin wants to take apio (with anya-san)

Compilation message (stderr)

historic.cpp: In function 'void update(int, int, int, int, int)':
historic.cpp:53:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   53 |  int mid = l + r >> 1;
      |            ~~^~~
historic.cpp: In function 'int main()':
historic.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(NAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
historic.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(NAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 0 / 60