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답안 #428844

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
428844 2021-06-15T14:50:00 Z tqbfjotld Sparklers (JOI17_sparklers) C++14
0 / 100
 65 ms 16092 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

pair<int,int> memo[1005][1005];
int arr[100005];

int K,T,N;
int M;

pair<int,int> func(int a, int b){
    if (a==b) return a==K?make_pair(arr[K]-M*T,arr[K]+M*T):make_pair(999999999999999999LL,-999999999999999999LL);
    if (memo[a][b]!=make_pair(-1LL,-1LL)) return memo[a][b];
    if (b<K || a>K) return {999999999999999999LL,-999999999999999999LL};
    auto opt1 = func(a,b-1);
    auto opt2 = func(a+1,b);
        //printf("opt1 = %lld %lld, \n",opt1);
       // printf("optw = %lld %lld, ab = %lld %lld\n",opt2,a,b);
    if (opt1.second<opt1.first){
        if (opt2.second<opt2.first) return memo[a][b] = {999999999999999999LL,-999999999999999999LL};
        int sz = (b-a);
        if (sz*T*M+arr[a]<opt2.first) return memo[a][b] = {999999999999999999LL,-999999999999999999LL};
        return memo[a][b] = {opt2.first-T*M,(sz+1)*T*M+arr[a]};
    }
    else {
            int sz = (b-a);
            if (-sz*T*M+arr[b]>opt1.second) return memo[a][b] = {999999999999999999LL,-999999999999999999LL};
            return memo[a][b] = {-(sz+1)*T*M+arr[b],opt1.second+T*M};

    }
}

bool test(int val){
    M = val;
    memset(memo,-1,sizeof(memo));
    auto res = func(0,N-1);
    //printf("val = %lld, res = %lld %lld\n",val,res);
    return res.second>res.first;
}

main(){
    long long n,k,t;
    scanf("%lld%lld%lld",&n,&k,&t);
    N = n; K = k; T = t;
    K--;
    for (int x = 0; x<N; x++){
        long long t;
        scanf("%lld",&t);
        arr[x] = t;
    }
    int r = 1000000000LL/T+1;
    int l = -1LL;
    while (l+1<r){
        int mid = (l+r)/2;
        if (test(mid)){
            r = mid;
        }
        else l = mid;
    }
    printf("%lld\n",r);
}

Compilation message

sparklers.cpp:41:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   41 | main(){
      | ^~~~
sparklers.cpp: In function 'int main()':
sparklers.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     scanf("%lld%lld%lld",&n,&k,&t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         scanf("%lld",&t);
      |         ~~~~~^~~~~~~~~~~

Subtask #1
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 64 ms 16076 KB Output is correct
2 Correct 61 ms 16076 KB Output is correct
3 Correct 64 ms 16076 KB Output is correct
4 Correct 65 ms 16076 KB Output is correct
5 Correct 59 ms 16092 KB Output is correct
6 Correct 60 ms 16076 KB Output is correct
7 Correct 64 ms 16088 KB Output is correct
8 Correct 60 ms 16076 KB Output is correct
9 Correct 61 ms 16088 KB Output is correct
10 Correct 60 ms 16092 KB Output is correct
11 Correct 58 ms 16076 KB Output is correct
12 Correct 64 ms 16088 KB Output is correct
13 Correct 62 ms 16084 KB Output is correct
14 Correct 64 ms 16076 KB Output is correct
15 Correct 63 ms 16076 KB Output is correct
16 Correct 60 ms 16076 KB Output is correct
17 Correct 64 ms 16076 KB Output is correct
18 Correct 64 ms 16092 KB Output is correct
19 Incorrect 62 ms 16076 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 64 ms 16076 KB Output is correct
2 Correct 61 ms 16076 KB Output is correct
3 Correct 64 ms 16076 KB Output is correct
4 Correct 65 ms 16076 KB Output is correct
5 Correct 59 ms 16092 KB Output is correct
6 Correct 60 ms 16076 KB Output is correct
7 Correct 64 ms 16088 KB Output is correct
8 Correct 60 ms 16076 KB Output is correct
9 Correct 61 ms 16088 KB Output is correct
10 Correct 60 ms 16092 KB Output is correct
11 Correct 58 ms 16076 KB Output is correct
12 Correct 64 ms 16088 KB Output is correct
13 Correct 62 ms 16084 KB Output is correct
14 Correct 64 ms 16076 KB Output is correct
15 Correct 63 ms 16076 KB Output is correct
16 Correct 60 ms 16076 KB Output is correct
17 Correct 64 ms 16076 KB Output is correct
18 Correct 64 ms 16092 KB Output is correct
19 Incorrect 62 ms 16076 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 64 ms 16076 KB Output is correct
2 Correct 61 ms 16076 KB Output is correct
3 Correct 64 ms 16076 KB Output is correct
4 Correct 65 ms 16076 KB Output is correct
5 Correct 59 ms 16092 KB Output is correct
6 Correct 60 ms 16076 KB Output is correct
7 Correct 64 ms 16088 KB Output is correct
8 Correct 60 ms 16076 KB Output is correct
9 Correct 61 ms 16088 KB Output is correct
10 Correct 60 ms 16092 KB Output is correct
11 Correct 58 ms 16076 KB Output is correct
12 Correct 64 ms 16088 KB Output is correct
13 Correct 62 ms 16084 KB Output is correct
14 Correct 64 ms 16076 KB Output is correct
15 Correct 63 ms 16076 KB Output is correct
16 Correct 60 ms 16076 KB Output is correct
17 Correct 64 ms 16076 KB Output is correct
18 Correct 64 ms 16092 KB Output is correct
19 Incorrect 62 ms 16076 KB Output isn't correct
20 Halted 0 ms 0 KB -