Submission #70592

#	Time	Username	Problem	Language	Result	Execution time	Memory
70592		octopuses	Alternating Current (BOI18_alternating)	C++17	19 / 100	95 ms	18712 KiB

alternating

//Giorgi Kldiashvili
#include <bits/stdc++.h>

#define ll long long


using namespace std;

const int N = 100020;

vector < pair < int, int > > A[N];
int answer[N], S[2];
int n, m;

int main()
{
  scanf("%d %d", &n, &m);
  for(int i = 1; i <= m; ++ i)
  {
    int x, y;
    scanf("%d %d", &x, &y);
    A[x].push_back(make_pair(y, i));
  }
  S[0] = S[1] = 0;
  for(int i = 1; i <= n; ++ i)
  {
    for(int j = 0; j < A[i].size(); ++ j)
    {
      int c = (S[0] < S[1])?0:1;
      S[c] = max(S[c], A[i][j].first);
      answer[A[i][j].second] = c;
    }
    if(S[0] < i || S[1] < i)
      return printf("impossible"), 0;
  }
  for(int i = 1; i <= m; ++ i)
    printf("%d", answer[i]);
}

Compilation message (stderr)

alternating.cpp: In function 'int main()':
alternating.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j = 0; j < A[i].size(); ++ j)
                    ~~^~~~~~~~~~~~~
alternating.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &n, &m);
   ~~~~~^~~~~~~~~~~~~~~~~
alternating.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &x, &y);
     ~~~~~^~~~~~~~~~~~~~~~~

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