Submission #1354621

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Source Code Expand

#include<stdio.h>
#include<assert.h>
#include<vector>
#include<string.h>
#include<algorithm>
#include<memory.h>
#include<cmath>
#include<string>
#include<iostream>
#include<set>
#include<unordered_set>
#include<map>
#include<queue>
#include<functional>
#include<list>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<double, double> pdd;
typedef tuple<int,int,int> t3;

const int MX = 200005;
const int MM = 1000000007;

struct UF{
	int t[MX], c[MX];
	void clear(){
		for(int i = 0; i < MX; i++) t[i] = i, c[i] = 1;
	}
	int find(int a){ return t[a] == a ? a : t[a] = find(t[a]); }
	int merge(int a, int b){
		a = find(a), b = find(b);
		t[a] = b, c[b] += c[a];
	}
} uf;

int D[MX], E[MX];
int N;

int main()
{
	scanf("%d", &N);
	for(int i = 1; i <= N; i++) scanf("%d", D+i), E[i] = i;
	sort(E+1, E+N+1, [](int l, int r){ return D[l] > D[r]; });
	uf.clear();
	ll ans = 0;
	for(int i = 1; i <= N; i++){
		int c = E[i];
		int a = 1, b = 1;
		if( c >= 2 && D[c-1] > D[c] ) a += uf.c[uf.find(c-1)], uf.merge(c, c-1);
		if( c < N && D[c+1] > D[c] ) b += uf.c[uf.find(c+1)], uf.merge(c, c+1);
		ans += (ll)a * b * D[c];
	}
	printf("%lld\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:45:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
./Main.cpp:46:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= N; i++) scanf("%d", D+i), E[i] = i;
                                                        ^

Judge Result