Submission #1172519

#	Time	Username	Problem	Language	Result	Execution time	Memory
1172519		versesrev	Detecting Molecules (IOI16_molecules)	C++20	Compilation error	0 ms	0 KiB

molecules

// 21:19

#include <vector>

int[] find_subset(int low, int up, int w[]) {
  int n = sizeof(w) / sizeof(int);
  std::vector<std::vector<bool>> back(n, std::vector<int>(up + 1, -1));
  back[0][0] = 0;
  if (w[0] <= up) back[0][w[0]] = 0;
  for (int i = 1; i < n; ++i) {
    for (int j = 0; j <= up; ++j) {
      if (w[i] <= j and back[i - 1][j - w[i]] != -1) {
        back[i][j] = j - w[i];
      }
      else if (back[i - 1][j] != -1) {
        back[i][j] = j;
      }
      else back[i][j] = -1;
    }
  }
  
  std::vector<int> ans;
  int start_j = -1;
  int start_i = -1;
  for (int i = 0; i < n and start_i == -1; ++i) {
    for (int j = low ; start_j == -1 and j <= up; ++j) {
      if (back[i][j] != -1) {
        start_i = i;
        start_j = j;
      }
    }
  }
  if (start_i == -1) {
    int ary[0];
    return ary;
  }
  int cur_i = start_i;
  int cur_j = start_j;
  while (cur_j != 0) {
    if (back[cur_i][cur_j] == cur_j) {
      cur_i -= 1;
    }
    else {
      ans.push_back(cur_i);
      cur_j = back[cur_i][cur_j];
      cur_i -= 1;
    }
  }
  int ary[ans.size()];
  for (int i = 0; i < ans.size(); ++i) ary[i] = ans[i];
  return ary;
}

Compilation message (stderr)

molecules.cpp:5:4: error: structured binding declaration cannot have type 'int'
    5 | int[] find_subset(int low, int up, int w[]) {
      |    ^~
molecules.cpp:5:4: note: type must be cv-qualified 'auto' or reference to cv-qualified 'auto'
molecules.cpp:5:4: error: empty structured binding declaration
molecules.cpp:5:7: error: expected initializer before 'find_subset'
    5 | int[] find_subset(int low, int up, int w[]) {
      |       ^~~~~~~~~~~
molecules.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
molecules_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~