Submission #927061

#	Time	Username	Problem	Language	Result	Execution time	Memory
927061		vjudge1	Martian DNA (BOI18_dna)	C++17	100 / 100	66 ms	35404 KiB

dna

// By ObeliX
#include <bits/stdc++.h>
#pragma GCC target( "sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#include <unordered_map>
#include <cstddef>
#include <cassert>
#include <bitset>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cmath>
#include <queue>
#include <map>
#include <set>

using namespace std;

const long long N = 1e6 + 5;
const long long mod = 1e9+7;
const long long INF = 1e18;

string al = "abcdefghijklmnopqrstuvwxyz";

long long n , k , r;
long long x[N];
long long a[N];
vector <int> v[N];

int main(){
    //freopen( "cinema.in" , "r" , stdin );
    //freopen( "cinema.out" , "w" , stdout );
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> k >> r;
    for ( int i = 1 ; i <= n ; i++ ) {
        cin >> a[i];
        v[a[i]].push_back( i );
    }
    long long ans = 0;
    int can = 0;
    for ( int i = 1 ; i <= r ; i++ ) {
         long long x1 , y;
         cin >> x1 >> y;
         if ( v[x1].size() < y ) {
             can = 1;
         }
         else {
            ans = max( ans , 1ll * v[x1][y-1] );
         }
         x[x1] = y;
    }
    if ( can == 1 ) {
        cout << "impossible";
        return 0;
    }
    long long mx = ans;
    for ( int i = 1 ; i <= n ; i++ ) {
        ans = min( ans , mx - i + 1 );
        if ( x[a[i]] != 0 ) {
            x[a[i]]++;
            if ( x[a[i]] > v[a[i]].size() ) {
                break;
            }
            mx = max( mx , 1ll * v[a[i]][x[a[i]] - 1] );
        }
    }
    cout << ans;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:46:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   46 |          if ( v[x1].size() < y ) {
      |               ~~~~~~~~~~~~~^~~
dna.cpp:63:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |             if ( x[a[i]] > v[a[i]].size() ) {
      |                  ~~~~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32