Submission #27105

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
27105	2017-07-09 09:18:04	gs14004	Swap (BOI16_swap)	C++14	100 / 100	783 ms	168568 KiB

swap

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#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef long double llf;
int n, a[530000];
map<int, int> sol[200005];
int solve(int x, int r){
  if(x > n) return -1;
  if(sol[x].find(r) != sol[x].end()) return sol[x][r];
  int minval = min({r, a[2*x], a[2*x+1]});
  if(minval == r){
    solve(2*x, a[2*x]);
    solve(2*x+1, a[2*x+1]);
    return sol[x][r] = x;
  }
  else if(minval == a[2*x]){
    int ret = solve(2*x, r);
    solve(2*x+1, a[2*x+1]);
    return sol[x][r] = ret;
  }
  else{
    int k1 = solve(2*x, r);
    int k2 = solve(2*x+1, a[2*x]);
    int k3 = solve(2*x, a[2*x]);
    int k4 = solve(2*x+1, r);
    if(min(k1, k2) < min(k3, k4)){
      return sol[x][r] = k1;
 
 
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Compilation message (stderr)

swap.cpp: In function 'void fmerge(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
swap.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1; pnt < max(v1.size(), v2.size()); i<<=1){
                   ^
swap.cpp:57:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=pnt; j<pnt + i && j < v1.size(); j++){
                                 ^
swap.cpp:60:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=pnt; j<pnt + i && j < v2.size(); j++){
                                 ^
swap.cpp: In function 'std::vector<int> track(int, int)':
swap.cpp:86:7: warning: unused variable 'k4' [-Wunused-variable]
   int k4 = solve(2*x+1, r);
       ^
swap.cpp: In function 'int main()':
swap.cpp:107:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
swap.cpp:109:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
                    ^

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 32 / 32