Submission #428216

#	Time	Username	Problem	Language	Result	Execution time	Memory
428216		Amylopectin	Remittance (JOI19_remittance)	C++14	0 / 100	1 ms	304 KiB

remittance

#include <iostream>
#include <stdio.h>
using namespace std;
const long long mxn = 4e6 + 10,mxi = 1e10 + 10;
long long be[mxn] = {},af[mxn] = {},tw[mxn] = {};
long long fima(long long l,long long r)
{
    if(l > r)
        return l;
    return r;
}
int main()
{
    long long i,j,n,m,cma = 0,fr = 0,cva = 0,of = 0,ba,ru;
    scanf("%lld",&n);
    for(i=0; i<n; i++)
    {
        scanf("%lld %lld",&be[i],&af[i]);
        cma = fima(cma,be[i] - af[i]);
    }
    tw[0] = 1;
    for(i=1; i<40; i++)
    {
        tw[i] = tw[i-1] * 2;
//        if(tw[i] > cma)
//        {
//            break;
//        }
    }
    ba = n-1;
    for(i=0; i<n; i++)
    {
        cva += be[i] - af[i];
        ru = ba;
        while((cva < 0 || cva%2 != 0) && ba > i)
        {
            ru = ba;
            while(((be[ru] - af[ru])%2 + 2) % 2 == 1 && ru > i+1)
            {
                ru --;
            }
            if(((be[ru] - af[ru])%2 + 2) % 2 == 1)
            {
                of = 1;
                break;
            }
            for(j=ru; j<ba; j++)
            {
                if((be[j] - af[j]) % 2 != 0)
                {
                    of = 1;
                    break;
                }
                be[j+1] += (be[j] - af[j]) / 2;
                be[j] = af[j];
            }
            if(i + n - ba > 38 || of == 1)
            {
                of = 1;
                break;
            }
            if((be[ba] - af[ba]) % tw[i+n-ba] == 0)
            {
                cva += (be[ba] - af[ba]) / tw[i+n-ba];
                ba = ru-1;
            }
            else
            {
                of = 1;
                break;
            }
        }
        if(ba == i || of == 1 || cva % 2 != 0)
        {
            break;
        }
        cva /= 2;
    }

//    for(i=n-1; i>=0; i--)
//    {
//        cva += be[i] - af[i];
//        while(cva > 0 && fr < i)
//        {
//            if(n-i+fr > 35)
//            {
//                of = 1;
//                break;
//            }
//            cva += (be[fr] - af[fr]) * tw[n-i + fr];
//            fr ++;
//        }
//        if(fr == i || of == 1)
//        {
//            break;
//        }
//        cva *= 2;
//        if(cva > mxi)
//        {
//            of = 1;
//            break;
//        }
//    }
    if(cva == 0 && of == 0)
    {
        printf("Yes\n");
    }
    else
    {
        printf("No\n");
    }
    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:14:21: warning: unused variable 'm' [-Wunused-variable]
   14 |     long long i,j,n,m,cma = 0,fr = 0,cva = 0,of = 0,ba,ru;
      |                     ^
remittance.cpp:14:31: warning: unused variable 'fr' [-Wunused-variable]
   14 |     long long i,j,n,m,cma = 0,fr = 0,cva = 0,of = 0,ba,ru;
      |                               ^~
remittance.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     scanf("%lld",&n);
      |     ~~~~~^~~~~~~~~~~
remittance.cpp:18:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         scanf("%lld %lld",&be[i],&af[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45