oj.uz

Submission #583803

# Submission time Handle Problem Language Result Execution time Memory
583803 2022-06-26T08:30:45 Z 79brue Sparklers (JOI17_sparklers) C++17
100 / 100
 92 ms 7884 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int n, k;
ll s;
ll arr[100002];

bool able(vector<ll> &v1, vector<ll> &v2){
    vector<pair<ll, ll> > vp1, vp2;
    ll prvMin = v1[0], tmpMax = v1[0];
    for(ll x: v1){
        tmpMax = max(tmpMax, x);
        if(x < prvMin){
            vp1.push_back(make_pair(tmpMax, x));
            prvMin = tmpMax = x;
        }
    }
    ll prvMax = v2[0], tmpMin = v2[0];
    for(ll x: v2){
        tmpMin = min(tmpMin, x);
        if(x > prvMax){
            vp2.push_back(make_pair(tmpMin, x));
            prvMax = tmpMin = x;
        }
    }
    reverse(vp1.begin(), vp1.end());
    reverse(vp2.begin(), vp2.end());
    ll L = v1[0], R = v2[0];
    while(!vp1.empty() || !vp2.empty()){
        if(!vp1.empty() && vp1.back().first <= R){
            L = vp1.back().second;
            vp1.pop_back();
        }
        else if(!vp2.empty() && vp2.back().first >= L){
            R = vp2.back().second;
            vp2.pop_back();
        }
        else return false;
    }
    return true;
}

bool able(ll speed){
    speed = min(speed * s * 2, ll(1e9));
    vector<ll> vecL, vecR;
    for(int i=k; i>=1; i--){
        vecL.push_back(speed * i - arr[i]);
    }
    for(int i=k; i<=n; i++){
        vecR.push_back(speed * i - arr[i]);
    }
    if(*max_element(vecL.begin(), vecL.end()) > *max_element(vecR.begin(), vecR.end())) return false;
    if(*min_element(vecL.begin(), vecL.end()) > *min_element(vecL.begin(), vecL.end())) return false;
    if(vecL.back() > vecR.back()) return false;

    auto it1 = min_element(vecL.begin(), vecL.end());
    auto it2 = max_element(vecR.begin(), vecR.end());
    vector<ll> vecL1(vecL.begin(), it1+1), vecL2(it1, vecL.end());
    vector<ll> vecR1(vecR.begin(), it2+1), vecR2(it2, vecR.end());
    reverse(vecL2.begin(), vecL2.end());
    reverse(vecR2.begin(), vecR2.end());

    if(!able(vecL1, vecR1)) return false;
    if(!able(vecL2, vecR2)) return false;
    return true;
}

int main(){
    scanf("%d %d %lld", &n, &k, &s);
    for(int i=1; i<=n; i++) scanf("%lld", &arr[i]);
    if(arr[1] == arr[n]){
        puts("0");
        return 0;
    }
    ll MIN = 1, MAX = 1e9, ANS = 1e9;
    while(MIN <= MAX){
        ll MID = (MIN + MAX) / 2;
        if(able(MID)) ANS = MID, MAX = MID-1;
        else MIN = MID+1;
    }
    printf("%lld", ANS);
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:72:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     scanf("%d %d %lld", &n, &k, &s);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:73:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     for(int i=1; i<=n; i++) scanf("%lld", &arr[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 312 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 312 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 316 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 312 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 312 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 316 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 316 KB Output is correct
24 Correct 1 ms 312 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 320 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 320 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 308 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 312 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 312 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 316 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 316 KB Output is correct
24 Correct 1 ms 312 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 320 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 320 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 308 KB Output is correct
41 Correct 52 ms 4408 KB Output is correct
42 Correct 2 ms 500 KB Output is correct
43 Correct 13 ms 1496 KB Output is correct
44 Correct 72 ms 7564 KB Output is correct
45 Correct 67 ms 6232 KB Output is correct
46 Correct 70 ms 7384 KB Output is correct
47 Correct 82 ms 7420 KB Output is correct
48 Correct 79 ms 6316 KB Output is correct
49 Correct 76 ms 7404 KB Output is correct
50 Correct 71 ms 6304 KB Output is correct
51 Correct 83 ms 7388 KB Output is correct
52 Correct 82 ms 7164 KB Output is correct
53 Correct 76 ms 7308 KB Output is correct
54 Correct 92 ms 7100 KB Output is correct
55 Correct 69 ms 6316 KB Output is correct
56 Correct 78 ms 7884 KB Output is correct
57 Correct 78 ms 7260 KB Output is correct
58 Correct 81 ms 6288 KB Output is correct
59 Correct 7 ms 1236 KB Output is correct
60 Correct 75 ms 7188 KB Output is correct
61 Correct 78 ms 6964 KB Output is correct
62 Correct 66 ms 7484 KB Output is correct
63 Correct 70 ms 6872 KB Output is correct
64 Correct 69 ms 6228 KB Output is correct
65 Correct 72 ms 6232 KB Output is correct
66 Correct 66 ms 6232 KB Output is correct
67 Correct 71 ms 6376 KB Output is correct
68 Correct 76 ms 7208 KB Output is correct
69 Correct 75 ms 7216 KB Output is correct