Submission #531566

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
531566	2022-03-01 04:16:32	amunduzbaev	Group Photo (JOI21_ho_t3)	C++17	100 / 100	817 ms	509340 KiB

Main

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#include "bits/stdc++.h"
using namespace std;
#define ar array
#define int long long
const int N = 5005;
int dp[N], a[N], pos[N];
int inv[N][N], is[N][N];
int pref[N][N];
signed main(){
  ios::sync_with_stdio(0); cin.tie(0);
  
  int n; cin>>n;
  for(int i=0;i<n;i++) cin>>a[i], a[i]--, pos[a[i]] = i;
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      is[i][j] = (pos[i] < pos[j]);
      if(i && j) pref[i][j] = pref[i-1][j] + pref[i][j-1] - pref[i-1][j-1];
      else if(i) pref[i][j] = pref[i-1][j];
      else if(j) pref[i][j] = pref[i][j-1];
      pref[i][j] += is[i][j];
    }
  }
  
  auto get = [&](int i, int x, int j, int y){
    if(i < x) swap(i, x);
    if(j < y) swap(j, y);
    return pref[i][j] - (y ? pref[i][y-1] : 0) - (x ? pref[x-1][j] : 0) + (x && y ? pref[x-1][y-1] : 0);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:30:39: warning: array subscript -2 is below array bounds of 'long long int [5005]' [-Warray-bounds]
   30 |   return pref[i][j] - (y ? pref[i][y-1] : 0) - (x ? pref[x-1][j] : 0) + (x && y ? pref[x-1][y-1] : 0);
      |                            ~~~~~~~~~~~^
Main.cpp:30:96: warning: array subscript -2 is below array bounds of 'long long int [5005]' [-Warray-bounds]
   30 |   return pref[i][j] - (y ? pref[i][y-1] : 0) - (x ? pref[x-1][j] : 0) + (x && y ? pref[x-1][y-1] : 0);
      |                                                                                   ~~~~~~~~~~~~~^

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 32 / 32
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36