Submission #2873327

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

typedef long long LL;
const int N = 200006;

int a[N];

int main ()
{
    int n;
    scanf("%d",&n);
    for (int i=1;n>=i;i++)
    {
        scanf("%d",&a[i]);
    }
    LL ans=0;
    int now_mn = 12345690;
    a[n+1] = 880301;
    for (int i=n;i>=1;i--)
    {
        if (a[i+1] == a[i] + 1) continue;
        else if (i - a[i] < 1)
        {
            puts("-1");
            return 0;
        }
        else
        {
            if (i-a[i] > now_mn)
            {
                puts("-1");
                return 0;
            }
            ans += (a[i]);
            now_mn = min(now_mn,i-a[i]);
        }
    }
    printf("%lld\n",ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:15:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
                          ^

Judge Result