Submission #226109

#	Time	Username	Problem	Language	Result	Execution time	Memory
226109		MKopchev	Alternating Current (BOI18_alternating)	C++14	13 / 100	2805 ms	3388 KiB

alternating

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

const int nmax=1e5+42;

const double TL=2.8;

int sz,n;
pair<int,int> inp[nmax];

double start;

int type[nmax];

int pref[2][nmax];

mt19937 rng(42);

void test()
{
    for(int i=1;i<=sz;i++)
    {
        pref[0][i]=0;
        pref[1][i]=0;
    }

    for(int i=1;i<=n;i++)
        if(inp[i].first<=inp[i].second)
        {
            pref[type[i]][inp[i].first]++;
            pref[type[i]][inp[i].second+1]--;
        }
        else
        {
            pref[type[i]][inp[i].first]++;
            pref[type[i]][sz+1]--;

            pref[type[i]][1]++;
            pref[type[i]][inp[i].second+1]--;
        }

    for(int i=1;i<=sz;i++)
    {
        pref[0][i]+=pref[0][i-1];
        if(pref[0][i]==0)return;

        pref[1][i]+=pref[1][i-1];
        if(pref[1][i]==0)return;
    }

    for(int i=1;i<=n;i++)
        printf("%i",type[i]);
    printf("\n");
    exit(0);
}

int main()
{
    start=clock();

    scanf("%i%i",&sz,&n);
    for(int i=1;i<=n;i++)
        scanf("%i%i",&inp[i].first,&inp[i].second);

    while(1.0*(clock()-start)/CLOCKS_PER_SEC<TL)
    {
        for(int i=1;i<=n;i++)
            type[i]=rng()%2;

        test();
    }

    printf("impossible\n");
    return 0;
}

Compilation message (stderr)

alternating.cpp: In function 'int main()':
alternating.cpp:61:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i%i",&sz,&n);
     ~~~~~^~~~~~~~~~~~~~~
alternating.cpp:63:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i%i",&inp[i].first,&inp[i].second);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 22
• Subtask 4: 0 / 19
• Subtask 5: 0 / 26