Submission #302156

#	Time	Username	Problem	Language	Result	Execution time	Memory
302156		edenooo	역사적 조사 (JOI14_historical)	C++17	100 / 100	3207 ms	7984 KiB

historic

#include<bits/stdc++.h>
using namespace std;
 
#define INF 1234567890
#define ll long long

const int SQ = 316, SZ = 131072;
struct Node {
	int l, r, i;
	bool operator<(Node &n)
	{
		if (l/SQ != n.l/SQ) return l/SQ < n.l/SQ;
		return r < n.r;
	}
};

int N, Q;
int A[100101], B[100101];
ll res[100101], seg[270000];
vector<Node> q;
priority_queue<ll> pq, del;
vector<int> com;

void Update(int n, int val) // 0-based
{
	n += SZ; seg[n] += val;
	for(n>>=1; n; n>>=1) seg[n] = max(seg[n<<1], seg[n<<1|1]);
}

int main()
{
	scanf("%d %d", &N, &Q);
	for(int i=1; i<=N; i++)
	{
		scanf("%d", &A[i]);
		com.push_back(A[i]);
	}
	// 좌표 압축
	sort(com.begin(), com.end());
	com.erase(unique(com.begin(), com.end()), com.end());
	for(int i=1; i<=N; i++)
		B[i] = lower_bound(com.begin(), com.end(), A[i]) - com.begin();

	// 오프라인 쿼리
	for(int i=1; i<=Q; i++)
	{
		int l, r;
		scanf("%d %d", &l, &r);
		q.push_back({l, r, i});
	}
	sort(q.begin(), q.end());

	// MO's
	int l = 1, r = 0; // [l, r]
	for(int i=0; i<q.size(); i++)
	{
		int nl = q[i].l, nr = q[i].r, idx = q[i].i;
		while(r < nr)
		{
			r++;
			Update(B[r], A[r]);
		}
		while(l < nl)
		{
			Update(B[l], -A[l]);
			l++;
		}
		while(nl < l)
		{
			l--;
			Update(B[l], A[l]);
		}
		while(nr < r)
		{
			Update(B[r], -A[r]);
			r--;
		}

		res[idx] = seg[1];
	}

	for(int i=1; i<=Q; i++)
		printf("%lld\n", res[i]);
	return 0;
}

Compilation message (stderr)

historic.cpp: In function 'int main()':
historic.cpp:55:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |  for(int i=0; i<q.size(); i++)
      |               ~^~~~~~~~~
historic.cpp:32:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |  scanf("%d %d", &N, &Q);
      |  ~~~~~^~~~~~~~~~~~~~~~~
historic.cpp:35:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |   scanf("%d", &A[i]);
      |   ~~~~~^~~~~~~~~~~~~
historic.cpp:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   48 |   scanf("%d %d", &l, &r);
      |   ~~~~~^~~~~~~~~~~~~~~~~

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