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Submission #72463

# Submission time Handle Problem Language Result Execution time Memory
72463 2018-08-26T08:20:46 Z 유애나(#2199, kdh9949) Hill Reconstruction (FXCUP3_hill) C++17
100 / 100
 348 ms 5424 KB 
#include <bits/stdc++.h>
using namespace std;

using ld = long double;
using ll = long long;

const int N = 300005, TRIAL = 70;

int n;
ll a[N], b[N], c, mb, ma;

int f(ld x){
    mb = 0; ma = 1;
    int lst = n - 1;
    ll s = 0, cs = 0;
    for(int i = n - 2; i >= 0; i--){
        cs += (a[i] * b[i + 1] - b[i] * a[i + 1]);
        if(ld(b[lst] - b[i]) / (a[lst] - a[i]) <= x){
            cs += (a[lst] * b[i] - b[lst] * a[i]);
            s += abs(cs);
            if(ma * (b[lst] - b[i]) > mb * (a[lst] - a[i])){
                mb = b[lst] - b[i];
                ma = a[lst] - a[i];
            }
            lst = i;
            cs = 0;
        }
        if(s > 2 * c) return 0;
    }
    return !lst;
}

int main(){
    scanf("%d%lld", &n, &c);
    for(int i = 0; i < n; i++) scanf("%lld", a + i);
    for(int i = 0; i < n; i++) scanf("%lld", b + i);
    ld l = 0, r = 1e9;
    for(int i = 0; i < TRIAL; i++){
        ld m = (l + r) / 2;
        if(f(m)) r = m;
        else l = m;
    }
    f(l + 1e-9);
    printf("%lld/%lld\n", mb / gcd(mb, ma), ma / gcd(mb, ma));
}

Compilation message

hill.cpp: In function 'int main()':
hill.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%lld", &n, &c);
     ~~~~~^~~~~~~~~~~~~~~~~~
hill.cpp:35:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 0; i < n; i++) scanf("%lld", a + i);
                                ~~~~~^~~~~~~~~~~~~~~
hill.cpp:36:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 0; i < n; i++) scanf("%lld", b + i);
                                ~~~~~^~~~~~~~~~~~~~~

Subtask #1
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 3 ms 436 KB Output is correct
4 Correct 3 ms 492 KB Output is correct
5 Correct 3 ms 604 KB Output is correct
6 Correct 3 ms 604 KB Output is correct
7 Correct 3 ms 604 KB Output is correct
8 Correct 3 ms 604 KB Output is correct

Subtask #2
68.0 / 68.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 3 ms 436 KB Output is correct
4 Correct 3 ms 492 KB Output is correct
5 Correct 3 ms 604 KB Output is correct
6 Correct 3 ms 604 KB Output is correct
7 Correct 3 ms 604 KB Output is correct
8 Correct 3 ms 604 KB Output is correct
9 Correct 316 ms 5280 KB Output is correct
10 Correct 272 ms 5280 KB Output is correct
11 Correct 268 ms 5308 KB Output is correct
12 Correct 348 ms 5424 KB Output is correct
13 Correct 172 ms 5424 KB Output is correct
14 Correct 120 ms 5424 KB Output is correct
15 Correct 205 ms 5424 KB Output is correct
16 Correct 234 ms 5424 KB Output is correct
17 Correct 173 ms 5424 KB Output is correct
18 Correct 197 ms 5424 KB Output is correct
19 Correct 265 ms 5424 KB Output is correct