Submission #371154

#	Time	Username	Problem	Language	Result	Execution time	Memory
371154		daniel920712	Intergalactic ship (IZhO19_xorsum)	C++14	17 / 100	2092 ms	5740 KiB

xorsum

#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;
long long all[200005];
pair < pair < long long , long long > , long long > tt[200005];
long long ans=0,N,M,MOD=1e9+7;
void F(long long here)
{
    long long i,j,t;
    if(here==M)
    {
        t=0;
        for(i=1;i<=N;i++)
        {
            t+=2*all[i]*(N-i+1)%MOD;
            t%=MOD;
        }
        for(i=1;i<=N;i++)
        {
            ans+=all[i]*all[i]*i*(N-i+1);
            ans%=MOD;
            t-=2*all[i]*(N-i+1)%MOD;
            t+=MOD;
            t%=MOD;
            ans+=all[i]*i*t%MOD;
            ans%=MOD;


        }
        return;
    }
    F(here+1);
    for(i=tt[here].first.first;i<=tt[here].first.second;i++) all[i]^=tt[here].second;
    F(here+1);
    for(i=tt[here].first.first;i<=tt[here].first.second;i++) all[i]^=tt[here].second;
}
int main()
{
    long long i;
    scanf("%lld",&N);
    for(i=1;i<=N;i++) scanf("%lld",&all[i]);
    scanf("%lld",&M);
    //printf("%lld\n",M);
    for(i=0;i<M;i++) scanf("%lld %lld %lld",&tt[i].first.first,&tt[i].first.second,&tt[i].second);
    F(0);
    printf("%lld\n",ans);
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'void F(long long int)':
xorsum.cpp:11:17: warning: unused variable 'j' [-Wunused-variable]
   11 |     long long i,j,t;
      |                 ^
xorsum.cpp: In function 'int main()':
xorsum.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |     scanf("%lld",&N);
      |     ~~~~~^~~~~~~~~~~
xorsum.cpp:43:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   43 |     for(i=1;i<=N;i++) scanf("%lld",&all[i]);
      |                       ~~~~~^~~~~~~~~~~~~~~~
xorsum.cpp:44:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |     scanf("%lld",&M);
      |     ~~~~~^~~~~~~~~~~
xorsum.cpp:46:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |     for(i=0;i<M;i++) scanf("%lld %lld %lld",&tt[i].first.first,&tt[i].first.second,&tt[i].second);
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 0 / 6
• Subtask 4: 0 / 9
• Subtask 5: 8 / 8
• Subtask 6: 0 / 11
• Subtask 7: 0 / 19
• Subtask 8: 0 / 30
• Subtask 9: 0 / 8