Submission #39390

#	Time	Username	Problem	Language	Result	Execution time	Memory
39390		Extazy	Money (IZhO17_money)	C++14	0 / 100	0 ms	17804 KiB

money

#include <bits/stdc++.h>
#define endl '\n'
#define left lkahgljah
#define prev qiyhtouqhkjq

using namespace std;

const int N = 1000007;

int n,a[N],from[N];
multiset < int > s;
int dp[N];
int left[N];
multiset < int >::iterator prev(multiset < int >::iterator it) {
    --it;
    return it;
}

bool are_consecutive(int v1, int v2) {
    if(v1>v2) return false;
    if(v1==v2) return true;
    return *prev(s.lower_bound(v2))==v1; 
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int i,j;

    scanf("%d", &n);
    for(i=1;i<=n;i++) {
        scanf("%d", &a[i]);
    }

    for(i=n;i>=1;i--) {
        left[a[i]]=i;
    }

    s.insert(a[1]);
    from[1]=1;
    for(i=2;i<=n;i++) {
        s.insert(a[i]);
        if(are_consecutive(a[i-1],a[i]) && left[a[i]]>=from[i-1]) from[i]=from[i-1];
        else from[i]=i;
    }

    for(i=1;i<=n;i++) {
        dp[i]=1000007;
        for(j=from[i];j<=i;j++) {
            dp[i]=min(dp[i],dp[j-1]+1);
        }
    }
    printf("%d\n", dp[n]);
    
    return 0;
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:30:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
money.cpp:32:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
                           ^

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