제출 #329142

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
329142		M_W	Mountains (NOI20_mountains)	C++14	64 / 100	2095 ms	10064 KiB

Mountains

#include <bits/stdc++.h>
using namespace std;
long long h[300300];
vector<long long> v;

int main(){
	int N;
	vector<long long> cnt;
	scanf("%d", &N);
	for(int i = 0; i < N; i++){
		scanf("%lld", &h[i]);
		if(i == 0){
			v.push_back(h[i]);
			cnt.push_back(0);
			continue;
		}
		auto it = upper_bound(v.begin(), v.end(), h[i]);
		v.insert(it, h[i]);
		cnt.push_back(lower_bound(v.begin(), v.end(), h[i]) - v.begin());
	}
	v.clear();
	long long sum = 0;
	for(int i = N - 1; i >= 0; i--){
		if(i == 0){
			v.push_back(h[i]);
			cnt.push_back(0);
			continue;
		}
		auto it = upper_bound(v.begin(), v.end(), h[i]);
		v.insert(it, h[i]);
		sum += cnt[i] * 1ll * (lower_bound(v.begin(), v.end(), h[i]) - v.begin()) * 1ll;
	}
	printf("%lld", sum);
}

컴파일 시 표준 에러 (stderr) 메시지

Mountains.cpp: In function 'int main()':
Mountains.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
Mountains.cpp:11:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |   scanf("%lld", &h[i]);
      |   ~~~~~^~~~~~~~~~~~~~~

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