Submission #72150

#	Time	Username	Problem	Language	Result	Execution time	Memory
72150		동진의 (#118)	Easy Data Structure Problem (FXCUP3_easy)	C++17	0 / 100	2 ms	248 KiB

easy

#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <iostream>
using namespace std;
int N, Q, L, R;
int input[100005];
int segTree[400020];
int max_num = 0x7FFFFFFF;
int min_num = 0;
int i, j, lo, hi;

void construct_tree_min(int input[], int segTree[], int low, int high, int pos) {
	if (low == high)
	{
		segTree[pos] = input[low];
		return;
	}
	int mid = (low + high) / 2;
	construct_tree_min(input, segTree, low, mid, 2 * pos + 1);
	construct_tree_min(input, segTree, mid + 1, high, 2 * pos + 2);
	segTree[pos] = min(segTree[2 * pos + 1], segTree[2 * pos + 2]);
}

int rangeQuery(int segTree[], int qlow, int qhigh, int low, int high, int pos) {
	if (qlow <= low && high <= qhigh) // overlap
		return segTree[pos];
	if (qlow > high || qhigh < low)  // no overlap
		return max_num;
	int mid = (low + high) / 2;
	return min(rangeQuery(segTree, qlow, qhigh, low, mid, 2 * pos + 1), rangeQuery(segTree, qlow, qhigh, mid + 1, high, 2 * pos + 2));
}



int main()
{
	//ip1 N Q
	scanf(" %d %d", &N, &Q);

	//ip2
	for (int i = 1; i <= N; i++)
	{
		scanf(" %d", &input[i]);
	}

	//Makig tree
	construct_tree_min(input, segTree, 1, N, 0);

	//Query
	for (int i = 0; i < Q; i++)
	{
		int a, b;
		scanf(" %d %d", &a, &b);

		printf("%d\n",rangeQuery(segTree, a, b, 1, N, 0) );
	}

	return 0;
}

Compilation message (stderr)

easy.cpp: In function 'int main()':
easy.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %d %d", &N, &Q);
  ~~~~~^~~~~~~~~~~~~~~~~~
easy.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %d", &input[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~
easy.cpp:54:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %d %d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 33
• Subtask 2: 0 / 67