SOJ 4478 Easy Problem II(栈)

题意:

$N\le 10^5,1-N的数按顺序入栈,现给定出栈序列,问是否合法$

分析:

$栈模拟一下就好了$
$时间复杂度O(n)$

代码:

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//
// Created by TaoSama on 2016-04-09
// Copyright (c) 2016 TaoSama. All rights reserved.
//
#pragma comment(linker, "/STACK:102400000,102400000")
#include <algorithm>
#include <cctype>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <string>
#include <set>
#include <vector>
#include <stack>
using namespace std;
#define pr(x) cout << #x << " = " << x << " "
#define prln(x) cout << #x << " = " << x << endl
const int N = 1e5 + 10, INF = 0x3f3f3f3f, MOD = 1e9 + 7;
int n;
int main() {
#ifdef LOCAL
freopen("C:\\Users\\TaoSama\\Desktop\\in.txt", "r", stdin);
// freopen("C:\\Users\\TaoSama\\Desktop\\out.txt","w",stdout);
#endif
ios_base::sync_with_stdio(0);
int t; scanf("%d", &t);
while(t--) {
scanf("%d", &n);
stack<int> s;
int cnt = 0, ok = 1;
for(int i = 1; i <= n; ++i) {
int x; scanf("%d", &x);
while(s.empty() || x != s.top()) {
if(cnt == n) {
ok = false;
break;
}
s.push(++cnt);
}
s.pop();
}
puts(ok ? "Yes" : "No");
}
return 0;
}


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