Submission #944875

#	Time	Username	Problem	Language	Result	Execution time	Memory
944875		sleepntsheep	Fancy Fence (CEOI20_fancyfence)	C11	0 / 100	1 ms	348 KiB

fancyfence

#include<stdio.h>

#define N 100002
int n,h[N],w[N],p[N],l[N],r[N];
long long pw[N];
long long z;

long long c(long long ww,long long hh)
{
    //printf(" Choose %lld %lld : %lld\n",ww,hh,((ww+1ll)*ww/2)*((hh+1ll)*hh/2));
    return ((ww+1ll)*ww/2)*((hh+1ll)*hh/2);
}

void dfs(int u,long long ll,long long rr,int y,int yy)
{
    if(!u)return;
    long long ww=pw[rr]-pw[ll-1];
    z = z + c(ww,y) - c(ww,yy);
    //printf(" AT %d : [%lld %lld], %d %lld\n",u,pw[ll-1]+1,pw[rr],y,z);
    dfs(l[u],ll,u-1,h[l[u]],y);
    dfs(r[u],u+1,rr,h[r[u]],y);
}

int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;++i)scanf("%d",h+i);
    for(int i=1;i<=n;++i)scanf("%d",w+i),pw[i]=pw[i-1]+w[i];

    for(int i=1;i<=n;++i)
    {
        p[i]=i-1;
        while(w[p[i]]>w[i])p[i]=p[p[i]];
        l[i]=r[p[i]];
        r[p[i]]=i;
        p[l[i]]=i;
    }

    for(int i=1;i<=n;++i)if(!p[i])dfs(i,1,n,h[i],0);
    printf("%lld",z);
}

Compilation message (stderr)

fancyfence.c: In function 'main':
fancyfence.c:26:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     scanf("%d",&n);
      |     ^~~~~~~~~~~~~~
fancyfence.c:27:26: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     for(int i=1;i<=n;++i)scanf("%d",h+i);
      |                          ^~~~~~~~~~~~~~~
fancyfence.c:28:26: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     for(int i=1;i<=n;++i)scanf("%d",w+i),pw[i]=pw[i-1]+w[i];
      |                          ^~~~~~~~~~~~~~~

• 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