Submission #2175803

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Source Code Expand

#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
int dat[202020];
int main()
{
	int num;
	scanf("%d", &num);
	vector<int>v;
	for (int i = 0; i < num; i++)
	{
		int z;
		scanf("%d", &z);
		z--;
		v.push_back(z);
		int low = lower_bound(v.begin(), v.end(), -z) - v.begin();
		dat[z] = low;
		if (low == v.size())v.push_back(-z);
		else v[low] = -z;
	}
	int ans = 0, bef = -1;
	for (int i = num - 1; i >= 0; i--)
	{
		if (bef == -1)
		{
			if (dat[i] > 0)ans++, bef = i + 1;
		}
		else
		{
			int a = dat[i], b = dat[i + 1], c = dat[bef];
			bool f;
			if (a == b)f = false;
			else if (a == c)f = true;
			else if (int(a < b) + int(b < c) + int(c < a) == 2)f = false;
			else f = true;
			if (f)ans++, bef = i + 1;
		}
	}
	printf("%d\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:9:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &num);
                   ^
./Main.cpp:14:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &z);
                  ^

Judge Result