Submission #419389

#	Time	Username	Problem	Language	Result	Execution time	Memory
419389		cpp219	Money (IZhO17_money)	C++14	0 / 100	1 ms	320 KiB

money

#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 1500 + 9;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
set<ll> s;
ll n,a[N],L = inf,R,ans = 1;

bool chk(ll l,ll r){
    assert(l <= r);
    return (l > *s.rbegin()) || (r < *s.begin()) || (*s.lower_bound(l) == *s.lower_bound(r));
}

ll Travel(ll now){
    ll kq = now;
    ll l = a[now],r = a[now];
    for (ll i = now + 1;i <= n;i++){
        l = min(l,a[i]); r = max(r,a[i]);
        if (!chk(l,r) || a[i] < a[i - 1]) break; kq = i;
    }
    return kq;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n; s.insert(0); s.insert(inf);
    for (ll i = 1;i <= n;i++) cin>>a[i];
    for (ll i = 1;i <= n;){
        ll nxt = Travel(i); //cout<<nxt<<"x\n"; //return 0;
        for (ll j = i;j <= nxt;j++) s.insert(a[j]);
        ans += (i <= n);
        i = nxt + 1;
    }
    cout<<ans - 1;
}

Compilation message (stderr)

money.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization "O2"
      | 
money.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
money.cpp: In function 'int Travel(int)':
money.cpp:27:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   27 |         if (!chk(l,r) || a[i] < a[i - 1]) break; kq = i;
      |         ^~
money.cpp:27:50: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   27 |         if (!chk(l,r) || a[i] < a[i - 1]) break; kq = i;
      |                                                  ^~
money.cpp: In function 'int main()':
money.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55