Submission #437661

#	Time	Username	Problem	Language	Result	Execution time	Memory
437661		shahriarkhan	Fancy Fence (CEOI20_fancyfence)	C++14	30 / 100	34 ms	3788 KiB

fancyfence

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

const long long mod = 1e9 + 7 ;

int main()
{
    int n ;
    scanf("%d",&n) ;
    long long h[n+1] , w[n+1] , ans = 0 , suf = 0 ;
    for(int i = 1 ; i <= n ; ++i) scanf("%lld",&h[i]) ;
    for(int i = 1 ; i <= n ; ++i) scanf("%lld",&w[i]) ;
    h[0] = 0 ;
    for(int i = n ; i >= 1 ; --i)
    {
        suf = (suf + w[i])%mod ;
        long long extra = ((h[i]*(h[i]+1))/2)%mod ;
        extra = ((extra - ((h[i-1]*(h[i-1]+1))/2)%mod) + mod)%mod ;
        long long extra2 = ((suf*(suf+1))/2)%mod ;
        ans = (ans + ((extra*extra2)%mod))%mod ;
    }
    printf("%lld\n",ans) ;
    return 0 ;
}

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d",&n) ;
      |     ~~~~~^~~~~~~~~
fancyfence.cpp:11:40: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     for(int i = 1 ; i <= n ; ++i) scanf("%lld",&h[i]) ;
      |                                   ~~~~~^~~~~~~~~~~~~~
fancyfence.cpp:12:40: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     for(int i = 1 ; i <= n ; ++i) scanf("%lld",&w[i]) ;
      |                                   ~~~~~^~~~~~~~~~~~~~

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