Submission #1013572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013572		daffuwu	Fancy Fence (CEOI20_fancyfence)	C++14	30 / 100	1097 ms	2140 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

long long n, h[100069], w[100069], smw, ans, mn, sm, pv, cur;
const long long dv = 1e9+7;
vector<pair<long long, long long> > vc;

long long calc(long long a, long long b)
{
    if (a%2 == 0) a/=2;
    else b/=2;
    return a%dv*(b%dv)%dv;
}

int main() 
{
    long long i, j, up, dw;
    scanf("%lld", &n);
    for (i=1; i<=n; i++)
    {
        scanf("%lld", h+i);
    }
    for (i=1; i<=n; i++)
    {
        scanf("%lld", w+i);
    }
    for (i=1; i<=n; i++)
    {
        ans += calc(w[i], w[i]+1)*calc(h[i], h[i]+1)%dv;
        ans %= dv;
        mn = h[i];
        for (j=i+1; j<=n; j++)
        {
            mn = min(mn, h[j]);
            ans += w[i]*w[j]%dv*calc(mn, mn+1)%dv;
            ans %= dv;
        }
    }
    printf("%lld\n", ans);  
}

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:20:21: warning: unused variable 'up' [-Wunused-variable]
   20 |     long long i, j, up, dw;
      |                     ^~
fancyfence.cpp:20:25: warning: unused variable 'dw' [-Wunused-variable]
   20 |     long long i, j, up, dw;
      |                         ^~
fancyfence.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |     scanf("%lld", &n);
      |     ~~~~~^~~~~~~~~~~~
fancyfence.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         scanf("%lld", h+i);
      |         ~~~~~^~~~~~~~~~~~~
fancyfence.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         scanf("%lld", w+i);
      |         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 18 / 18
• Subtask 7: 0 / 27