Submission #372970

#	Time	Username	Problem	Language	Result	Execution time	Memory
372970		luciocf	Examination (JOI19_examination)	C++14	2 / 100	3082 ms	265060 KiB

examination

#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

typedef pair<int, int> pii;

const int maxn = 2e5+10;

struct BIT2D
{
	unordered_map<int, int> bit[maxn];

	void upd(int x, int y, int v)
	{
		for (int i = x; i < maxn; i += (i&-i))
			for (int j = y; j < maxn; j += (j&-j))
				bit[i][j] += v;
	}

	int soma(int x, int y)
	{
		int ans = 0;

		for (int i = x; i > 0; i -= (i&-i))
			for (int j = y; j > 0; j -= (j&-j))
				ans += bit[i][j];

		return ans;
	}
} BIT;

struct Query
{
	int x, y, z, ind;
} query[maxn];

pii a[maxn];
int ans[maxn];

int main(void)
{
	int n, q;
	scanf("%d %d", &n, &q);

	map<int, int> mpx, mpy;

	for (int i = 1; i <= n; i++)
	{
		scanf("%d %d", &a[i].ff, &a[i].ss);

		mpx[a[i].ff] = 0;
		mpy[a[i].ss] = 0;
	}

	for (int i = 1; i <= q; i++)
	{
		scanf("%d %d %d", &query[i].x, &query[i].y, &query[i].z);
		query[i].ind = i;

		mpx[query[i].x] = 0;
		mpy[query[i].y] = 0;
	}

	int aux = 0;
	for (auto &x: mpx)
		x.second = ++aux;

	aux = 0;
	for (auto &x: mpy)
		x.second = ++aux;

	sort(a+1, a+n+1, [&] (pii a, pii b) {return a.ff+a.ss > b.ff+b.ss;});
	sort(query+1, query+q+1, [&] (Query a, Query b) {return a.z > b.z;});

	int ptr = 1;

	for (int i = 1; i <= q; i++)
	{
		while (ptr <= n && a[ptr].ff+a[ptr].ss >= query[i].z)
		{
			BIT.upd(maxn-mpx[a[ptr].ff], maxn-mpy[a[ptr].ss], 1);
			ptr++;
		}

		ans[query[i].ind] = BIT.soma(maxn-mpx[query[i].x], maxn-mpy[query[i].y]);
	}

	for (int i = 1; i <= q; i++)
		printf("%d\n", ans[i]);
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |  scanf("%d %d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~~
examination.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |   scanf("%d %d", &a[i].ff, &a[i].ss);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
examination.cpp:60:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   60 |   scanf("%d %d %d", &query[i].x, &query[i].y, &query[i].z);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 0 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57