Submission #467584

#	Time	Username	Problem	Language	Result	Execution time	Memory
467584		mtxas	Exam (eJOI20_exam)	C++14	25 / 100	134 ms	196412 KiB

exam

#include <bits/stdc++.h>

#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define pll pair<ll, ll>
#define mii map<int, int>
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(x) ((int)x.size())
#define turbo() cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(false)
#define _fre() freopen("input.txt", "r", stdin)
#define _for(a, b, c) for(int (a) = (b); (a) < (c); (a)++)
#define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
#define _forneq(a, b, c) for(int (a) = (b); (a) >= (c); (a)--)
#define _forn(a, b, c) for(int (a) = (b); (a) > (c); (a)--)
using namespace std;
#define int ll
#define _min(a, b) a = min(a, b)
#define _max(a, b) a = max(a, b)
/***********************************************************************************
                                 STRUCTS
************************************************************************************/

/***********************************************************************************
                                VARIABLES
************************************************************************************/
const int maxn = 1e5+2;
int n;
int a[maxn], b[maxn];
/***********************************************************************************
                                FUNCTIONS
************************************************************************************/
int pass(int l, int r){
    int mx = 0;
    _foreq(i, l, r) mx = max(mx, a[i]);
    int ans = 0;
    _foreq(i, l, r) ans += (mx == b[i]);
    return ans;
}
bool subtask2(){
    bool yes = 1;
    _foreq(i, 2, n) yes &= (b[i] == b[i-1]);
    return yes;
}
bool subtask3(){
    _foreq(i, 2, n)
        if(a[i-1] >= a[i]) return false;
    return true;
}
int solve2(){
    int B = b[1]; a[n+1] = B+1;
    bool exists = 0;
    _foreq(i, 1, n) exists |= (a[i] == B);
    if(!exists){cout<<0; return 0;}
    int ans = 0;
    int start = 1; bool haveB = 0;
    _foreq(i, 1, n+1){
        if(a[i] > B) {
            if(haveB) ans += i-start;
            haveB = 0;
            start = i+1;
        }
        else if(a[i] == B) haveB = 1;
    }
    return ans;
}
int solve3(){
    vector<vi> dp(n+1, vi(n+1, 0));
    _foreq(i, 1, n){
        int mx = dp[i-1][i-1];
        _foreq(j, i, n){
            _max(mx, dp[i-1][j]);
            dp[i][j] = mx + (b[i] == a[j]);
        }
    }
    return dp[n][n];
}
void readInput(){
    cin>>n; _foreq(i, 1,n) cin>>a[i]; _foreq(i, 1, n) cin>>b[i];
}
/***********************************************************************************
                                  MAIN
************************************************************************************/
signed main(){
   // _fre();
    turbo();
    readInput();
    if(subtask2()) cout<<solve2();
    else if(subtask3()) cout<<solve3();
}

Compilation message (stderr)

exam.cpp: In function 'long long int pass(long long int, long long int)':
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:39:5: note: in expansion of macro '_foreq'
   39 |     _foreq(i, l, r) mx = max(mx, a[i]);
      |     ^~~~~~
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:41:5: note: in expansion of macro '_foreq'
   41 |     _foreq(i, l, r) ans += (mx == b[i]);
      |     ^~~~~~
exam.cpp: In function 'bool subtask2()':
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:46:5: note: in expansion of macro '_foreq'
   46 |     _foreq(i, 2, n) yes &= (b[i] == b[i-1]);
      |     ^~~~~~
exam.cpp: In function 'bool subtask3()':
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:50:5: note: in expansion of macro '_foreq'
   50 |     _foreq(i, 2, n)
      |     ^~~~~~
exam.cpp: In function 'long long int solve2()':
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:57:5: note: in expansion of macro '_foreq'
   57 |     _foreq(i, 1, n) exists |= (a[i] == B);
      |     ^~~~~~
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:61:5: note: in expansion of macro '_foreq'
   61 |     _foreq(i, 1, n+1){
      |     ^~~~~~
exam.cpp: In function 'long long int solve3()':
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:73:5: note: in expansion of macro '_foreq'
   73 |     _foreq(i, 1, n){
      |     ^~~~~~
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:75:9: note: in expansion of macro '_foreq'
   75 |         _foreq(j, i, n){
      |         ^~~~~~
exam.cpp: In function 'void readInput()':
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:83:13: note: in expansion of macro '_foreq'
   83 |     cin>>n; _foreq(i, 1,n) cin>>a[i]; _foreq(i, 1, n) cin>>b[i];
      |             ^~~~~~
exam.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
exam.cpp:83:39: note: in expansion of macro '_foreq'
   83 |     cin>>n; _foreq(i, 1,n) cin>>a[i]; _foreq(i, 1, n) cin>>b[i];
      |                                       ^~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 12 / 12
• Subtask 3: 13 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22