Submission #336857

#	Time	Username	Problem	Language	Result	Execution time	Memory
336857		boykut	Bigger segments (IZhO19_segments)	C++14	0 / 100	40 ms	492 KiB

segments

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

#define linl long long

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	
	vector < int > a(n);
	
	for (int & to : a) {
	  cin >> to;
  }
  
  int max = 0;
  
  if (n <= 20) {
    for (int i = 0; i < (1 << (n - 1)); i++) {
      vector < int > mas(n, 0);
      mas[0] = 0;
      
      int num = i, index = n - 1;
      while (num) {
        mas[index] = num % 2;
        num /= 2;
        index--;
      }
      //for (int to : mas) cout << to; cout << '\n';
      bool ok = true;
      for (int i = 0; i < n - 1 && ok; i++) {
        if (mas[i] == 1 && mas[i + 1] == 1) {
          ok = false;
        }
      }
      if (ok == false) continue;
      
      vector < int64_t > vec;
      int64_t sum = 0ll;
      bool ans = true;
      for (int i = 0; i < n; i++) {
        if (mas[i] == 1) {
          if (!vec.empty()) {
            if (sum < vec.back())
              ans = false;
          }
          vec.push_back(sum);
          sum = 0;
        }
        sum += a[i];
      }
      if (!vec.empty()) {
        if (sum < vec.back())
          ans = false;
      }
      vec.push_back(sum);
      if (ans && vec.size() > max)
        max = vec.size();
    }
    
    cout << max << '\n';
    
  }
	
	return 0;
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:59:29: warning: comparison of integer expressions of different signedness: 'std::vector<long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   59 |       if (ans && vec.size() > max)
      |                  ~~~~~~~~~~~^~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27