Submission #482466

#	Time	Username	Problem	Language	Result	Execution time	Memory
482466		SamAnd	Martian DNA (BOI18_dna)	C++17	100 / 100	116 ms	19524 KiB

dna

#include <bits/stdc++.h>
using namespace std;
const int N = 200005;
 
int n, k, r;
int a[N];
int b[N];
vector<int> v[N];
int j[N];
 
int main()
{
    scanf("%d%d%d", &n, &k, &r);
    for (int i = 1; i <= n; ++i)
        scanf("%d", &a[i]);
    while (r--)
    {
        int x, y;
        scanf("%d%d", &x, &y);
        b[x] = y;
    }
    for (int i = 1; i <= n; ++i)
        v[a[i]].push_back(i);
    set<int> s;
    for (int i = 0; i < k; ++i)
    {
        if (!b[i])
            continue;
        if (v[i].size() < b[i])
        {
            printf("impossible\n");
            return 0;
        }
        j[i] = b[i] - 1;
        s.insert(v[i][b[i] - 1]);
    }
    int ans = (*(--s.end()));
    for (int i = 2; i <= n; ++i)
    {
        if (b[a[i - 1]])
        {
            s.erase(v[a[i - 1]][j[a[i - 1]]]);
            ++j[a[i - 1]];
            if (!(j[a[i - 1]] < v[a[i - 1]].size()))
                break;
            s.insert(v[a[i - 1]][j[a[i - 1]]]);
        }
        ans = min(ans, (*(--s.end())) - i + 1);
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:29:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |         if (v[i].size() < b[i])
      |             ~~~~~~~~~~~~^~~~~~
dna.cpp:44:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |             if (!(j[a[i - 1]] < v[a[i - 1]].size()))
      |                   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
dna.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d%d%d", &n, &k, &r);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
dna.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
dna.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         scanf("%d%d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~

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