Submission #38234

#	Time	Username	Problem	Language	Result	Execution time	Memory
38234		antimirage	Money (IZhO17_money)	C++14	100 / 100	896 ms	21548 KiB

money

#include <iostream>
#include <vector>
#include <deque>
#include <math.h>
#include <set>
#include <iomanip>
#include <time.h>
#include <list>
#include <stdio.h>
#include <queue>
#include <map>
#include <algorithm>
#include <assert.h>
#include <memory.h>

#define mk make_pair
#define sc second
#define fr first
#define pb emplace_back
#define all(s) s.begin(), s.end()
#define sz(s) ( (int)s.size() )

using namespace std;

const int N = 1e6 + 5;

int n, ar[N], cur, ans, l = 1, Pos = 1e9 + 7, t[N * 4], mx = 1e6 + 1;

void update (int pos, int v = 1, int tl = 1, int tr = mx)
{
    if (tl == tr)
        t[v] = tl;
    else
    {
        int tm = (tl + tr) >> 1;
        if (pos <= tm)
            update( pos, v + v, tl, tm );
        else
            update( pos, v + v + 1, tm + 1, tr);

        t[v] = min(t[v + v] , t[v + v + 1]);
    }
}
inline int min(int a, int b)
{
    return a < b ? a : b;
}
int get (int val, int v = 1, int tl = 1, int tr = mx)
{
    if (t[v] == t[0] || val > tr)
        return 1e9 + 7;

    if (tl >= val)
        return t[v];

    int tm = (tl + tr) >> 1;

    return min( get( val, v + v, tl, tm ), get ( val, v + v + 1, tm + 1, tr ) );
}
main ()
{
    memset(t, 0x3f3f3f, sizeof(t));

    scanf("%d", &n);

    for (int i = 1; i <= n; i++)
        scanf("%d", &ar[i]);

    cur = ar[1];

    int i = 1;

    while (i <= n)
    {
        if ( ar[i] < ar[i - 1] || Pos < ar[i] )
        {
            ans++;
            cur = ar[i];

            while ( l < i )
                update( ar[l] ), l++;

            Pos = get( cur + 1 );
        }
        i++;
    }
    printf("%d\n", ans + 1);
}
/**
8
1 17 13 18 4 15 19 17
**/

Compilation message (stderr)

money.cpp:60:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main ()
       ^
money.cpp: In function 'int main()':
money.cpp:64:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
money.cpp:67:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &ar[i]);
                            ^

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