Submission #922182

#	Time	Username	Problem	Language	Result	Execution time	Memory
922182		Arp	Rainforest Jumps (APIO21_jumps)	C++17	Compilation error	0 ms	0 KiB

jumps

const int N = 2e5;
int ml[N],mr[N];
int best[N];
int arr[N];

void init(int n,vector<int> a){
  for(int i = 0;i<n;i++){
    ml[i] = -1;
    mr[i] = n;
    arr[i] = a[i];
  }  
  stack<int> lg;
  for(int i = 0;i<n;i++){
    while(lg.size() > 0 && arr[lg.top()] < arr[i]) lg.pop();
    if(lg.size() > 0){
      ml[i] = lg.top();
    }
    lg.push(i);
  }
  stack<int> rg;
  for(int i = n - 1;i >= 0;i--){
    while(rg.size() > 0 && arr[rg.top()] < arr[i]) rg.pop();
    if(rg.size() > 0){
      mr[i] = rg.top();
    }
    rg.push(i);
  }
  for(int i = 0;i<n;i++){
    best[i] = (ml[i] > mr[i] ? ml[i] : mr[i]);
  }
}

int minimum_jumps(int a,int b,int c,int d){
  int m2 = b;
  for(int i = c;i <= d;i ++){
    if(arr[i] > arr[m2]) m2 = i;
  }
  int m1 = a;
  for(int i = a;i <= b;i++){
    if(arr[i] > arr[m1] && arr[i] < arr[m2]) m1 = i;
  }
  if(arr[m1] > arr[m2]) return -1;
  int last = m1;
  int ans = 0;
  while(arr[best[last]] < arr[m2]){
    last = best[last];
    ans ++;
  }
  while(!(last >= c && last <= d)){
    if(arr[last] > arr[m2]) return -1;
    last = mr[last];
    ans ++;
  }
  return ans;
}

Compilation message (stderr)

jumps.cpp:7:17: error: 'vector' has not been declared
    7 | void init(int n,vector<int> a){
      |                 ^~~~~~
jumps.cpp:7:23: error: expected ',' or '...' before '<' token
    7 | void init(int n,vector<int> a){
      |                       ^
jumps.cpp: In function 'void init(int, int)':
jumps.cpp:11:14: error: 'a' was not declared in this scope
   11 |     arr[i] = a[i];
      |              ^
jumps.cpp:13:3: error: 'stack' was not declared in this scope
   13 |   stack<int> lg;
      |   ^~~~~
jumps.cpp:13:9: error: expected primary-expression before 'int'
   13 |   stack<int> lg;
      |         ^~~
jumps.cpp:15:11: error: 'lg' was not declared in this scope
   15 |     while(lg.size() > 0 && arr[lg.top()] < arr[i]) lg.pop();
      |           ^~
jumps.cpp:16:8: error: 'lg' was not declared in this scope
   16 |     if(lg.size() > 0){
      |        ^~
jumps.cpp:19:5: error: 'lg' was not declared in this scope
   19 |     lg.push(i);
      |     ^~
jumps.cpp:21:9: error: expected primary-expression before 'int'
   21 |   stack<int> rg;
      |         ^~~
jumps.cpp:23:11: error: 'rg' was not declared in this scope
   23 |     while(rg.size() > 0 && arr[rg.top()] < arr[i]) rg.pop();
      |           ^~
jumps.cpp:24:8: error: 'rg' was not declared in this scope
   24 |     if(rg.size() > 0){
      |        ^~
jumps.cpp:27:5: error: 'rg' was not declared in this scope
   27 |     rg.push(i);
      |     ^~