Submission #437619

#	Time	Username	Problem	Language	Result	Execution time	Memory
437619		shahriarkhan	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1 ms	204 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] = {0} , w[n+1] = {0} , dp[n+1][2] , ans = 0 ;
    for(int i = 1 ; i <= n ; ++i) scanf("%lld",&h[i]) ;
    for(int i = 1 ; i <= n ; ++i) scanf("%lld",&w[i]) ;
    for(int i = 0 ; i <= n ; ++i)
    {
        dp[i][1] = 0 , dp[i][2] = 0 ;
    }
    for(int i = 1 ; i <= n ; ++i)
    {
        for(int j = 1 ; j <= h[i] ; ++j)
        {
            dp[i][j] = (dp[i-1][j] + w[i])%mod ;
        }
        if((h[i-1]==2) && (h[i]==1))
        {
            ans = (ans + (dp[i-1][2]*(dp[i-1][2]+1))%mod)%mod ;
        }
    }
    ans = (ans + ((dp[n][1]*(dp[n][1]+1))/2)%mod)%mod ;
    if(h[n]==2) ans = (ans + (dp[n][2]*(dp[n][2]+1))%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]) ;
      |                                   ~~~~~^~~~~~~~~~~~~~
fancyfence.cpp:15:31: warning: array subscript 2 is above array bounds of 'long long int [2]' [-Warray-bounds]
   15 |         dp[i][1] = 0 , dp[i][2] = 0 ;
      |                        ~~~~~~~^
fancyfence.cpp:25:36: warning: array subscript 2 is above array bounds of 'long long int [2]' [-Warray-bounds]
   25 |             ans = (ans + (dp[i-1][2]*(dp[i-1][2]+1))%mod)%mod ;
      |                           ~~~~~~~~~^
fancyfence.cpp:29:38: warning: array subscript 2 is above array bounds of 'long long int [2]' [-Warray-bounds]
   29 |     if(h[n]==2) ans = (ans + (dp[n][2]*(dp[n][2]+1))%mod)%mod ;
      |                               ~~~~~~~^

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