Submission #1013540

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013540		daffuwu	Fancy Fence (CEOI20_fancyfence)	C++14	13 / 100	14 ms	3960 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;
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);
        if (i>1 && h[i] != h[i-1])
        {
            vc.push_back({smw, h[i-1]});
            smw = 0;
        }
        smw += w[i];
        sm += w[i];
    }
    vc.push_back({smw, h[n]});
    ans = calc(sm, sm+1);
    for (auto [wg, hg]:vc)
    {
        if (hg == 2) ans += 2*calc(wg, wg+1);
        // printf("hg = %lld wg = %lld\n", hg, wg);
        ans %= dv;
    }
    printf("%lld\n", ans);  
}

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:39:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   39 |     for (auto [wg, hg]:vc)
      |               ^
fancyfence.cpp:20:18: warning: unused variable 'j' [-Wunused-variable]
   20 |     long long i, j, up, dw;
      |                  ^
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: 0 / 12
• Subtask 3: 13 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27