Submission #1111271

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111271		SoMotThanhXuan	Martian DNA (BOI18_dna)	C++17	100 / 100	26 ms	3216 KiB

dna

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#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define REP(i, a, b) for(int i = a; i >= b; --i)
#define left _________left
#define right _________right
#define NAME ""
const int mod = 1e9 + 7;
inline bool maximize(int &u, int v){
    if(v > u){
        u = v;
        return true;
    }
    return false;
}
inline bool minimize(int &u, int v){
    if(v < u){
        u = v;
        return true;
    }
    return false;
}
inline bool maximizell(long long &u, long long v){
    if(v > u){
        u = v;
        return true;
    }
    return false;
}
inline bool minimizell(long long &u, long long v){
    if(v < u){
        u = v;
        return true;
    }
    return false;
}
inline int fastPow(int a, int n){
    if(n == 0) return 1;
    int t = fastPow(a, n >> 1);
    t = 1ll * t * t % mod;
    if(n & 1) t = 1ll * t * a % mod;
    return t;
}
inline void add(int &u, int v){
    u += v;
    if(u >= mod) u -= mod;
}
inline void sub(int &u, int v){
    u -= v;
    if(u < 0) u += mod;
}
const int maxN = 2e5 + 5;
int r, n, k, cnt[maxN], d[maxN], cur[maxN];
inline void process(){
    cin >> n >> k >> r;
    FOR(i, 1, n){
        cin >> d[i];
    }
    FOR(i, 1, r){
        int u, v;
        cin >> u >> v;
        cnt[u] = v;
    }
    int rem = 0, answer = n + 1;
    int i = 1, j = 1;
    while(j <= n){
        if(cnt[d[j]] > 0){
            ++cur[d[j]];
            if(cur[d[j]] == cnt[d[j]])++rem;
        }
        while(rem == r){
            minimize(answer, j - i + 1);
            if(cnt[d[i]] > 0){
                cur[d[i]]--;
                if(cur[d[i]] == cnt[d[i]] - 1)--rem;
            }
            ++i;
        }
        ++j;
    }
    if(answer == n + 1)cout << "impossible";
    else cout << answer;
}
int main(){
    if(fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
//    cin >> t;
    while(t--)
        process();
    cerr << '\n' << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << " s\n" ;
    return 0;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:144:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  144 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dna.cpp:145:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  145 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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