oj.uz

Submission #1027544

# Submission time Handle Problem Language Result Execution time Memory
1027544 2024-07-19T07:25:43 Z caterpillow Lasers (NOI19_lasers) C++17
100 / 100
 252 ms 29068 KB 
#include <bits/stdc++.h>

using namespace std;

using db = long double;
using ll = long long;
using pl = pair<ll, ll>;
using pi = pair<int, int>;
#define vt vector
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(), x.end() 
#define size(x) ((int) (x).size())
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define ROF(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define F0R(i, b) FOR (i, 0, b)
#define endl '\n'
const ll INF = 1e18;
const int inf = 1e9;

template<typename Tuple, size_t... Is>
void print_tuple(const Tuple& t, index_sequence<Is...>) {
    ((cerr << (Is == 0 ? "{" : ", ") << get<Is>(t)), ...);
    cerr << "}";
}

template<typename... Args>
ostream& operator<<(ostream& os, const tuple<Args...>& t) {
    print_tuple(t, index_sequence_for<Args...>{});
    return os;
}

ostream& operator<<(ostream& os, string& s) {
    for (char c : s) os << c; 
    return os;
}

template<template<typename> class Container, typename T>
ostream& operator<<(ostream& os, Container<T> o) {
    os << "{"; 
    int g = size(o); 
    for (auto i : o) os << i << ((--g) == 0 ? "" : ", "); 
    os << "}";
    return os;
}

template<typename T, typename V>
ostream& operator<<(ostream& os, const pair<T, V> p) {
    os << "{" << p.f << ", " << p.s << "}";
    return os;
}

template <typename T, typename... V>
void printer(const char *names, T &&head, V &&...tail) {
    int i = 0;
    while (names[i] != '\0' && names[i] != ',') i++;
    constexpr bool is_str = is_same_v<decay_t<T>, const char*>;
    if constexpr (is_str) cerr << head; // ignore directly passed strings
    else cerr.write(names, i) << " = " << head; 
    if constexpr (sizeof...(tail)) cerr << (is_str ? "" : ","), printer(names + i + 1, tail...);
    else cerr << endl;
}

#ifdef LOCAL
#define dbg(...) std::cerr << __LINE__ << ": ", printer(#__VA_ARGS__, __VA_ARGS__)
#else
#define dbg(x...)
#define cerr if (0) std::cerr
#endif

/*

instead, we want to count the # of lasers which are possible to not be blocked

for each laser, we just need to know if we can construct a configuration
where its not blocked

u can do the greedy strategy, where you pretend to slide each piece in each row to the left as much as possible,
and then sliding the rest to the right, and hoping u dont get blocked in the middle

this means we can just try each number of blocks aligned to the left on each row, and then range increment
the "gap" in the center, indicating that there is a configuration of the row such that light passes through
then, we just need to check which lights have a non-zero value over all rows

merge ranges, insert as events, then sweep

*/

main() {
    cin.tie(0)->sync_with_stdio(0);
    
    int cs, rs; cin >> cs >> rs;
    map<int, int> evs;
    evs[cs] = 0;
    F0R (_, rs) {
        int n; cin >> n;
        vt<int> blox(n + 1);
        F0R (i, n) cin >> blox[i + 1];
        FOR (i, 1, n + 1) blox[i] += blox[i - 1];
        int tot = accumulate(all(blox), 0);
        int l = 0, r = 0; // inc exc
        F0R (i, n + 1) {
            int lhs = blox[i], rhs = blox.back() - blox[i];
            int nl = lhs, nr = cs - rhs;
            if (nl <= r) { // merge ranges
                r = nr;
            } else { // flush range to events
                evs[l]++;
                evs[r]--;
                tie(l, r) = pi {nl, nr};
            }
        }
        evs[l]++;
        evs[r]--;
    }

    int ans = 0, last = 0, pfx = 0;
    for (auto [c, diff] : evs) { // exc
        if (pfx != rs) ans += c - last;
        pfx += diff;
        last = c;
    }
    cout << ans << endl;
}

Compilation message

lasers.cpp:90:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   90 | main() {
      | ^~~~
lasers.cpp: In function 'int main()':
lasers.cpp:101:13: warning: unused variable 'tot' [-Wunused-variable]
  101 |         int tot = accumulate(all(blox), 0);
      |             ^~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 452 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 452 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 103 ms 6056 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 220 ms 25688 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 16088 KB Output is correct
2 Correct 15 ms 2920 KB Output is correct
3 Correct 8 ms 2192 KB Output is correct
4 Correct 62 ms 17960 KB Output is correct
5 Correct 22 ms 7260 KB Output is correct
6 Correct 26 ms 6108 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 36 ms 7872 KB Output is correct
9 Correct 56 ms 13056 KB Output is correct
10 Correct 85 ms 19868 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 456 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #5
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 16088 KB Output is correct
2 Correct 15 ms 2920 KB Output is correct
3 Correct 8 ms 2192 KB Output is correct
4 Correct 62 ms 17960 KB Output is correct
5 Correct 22 ms 7260 KB Output is correct
6 Correct 26 ms 6108 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 36 ms 7872 KB Output is correct
9 Correct 56 ms 13056 KB Output is correct
10 Correct 85 ms 19868 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 456 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 221 ms 22356 KB Output is correct
22 Correct 42 ms 6632 KB Output is correct
23 Correct 21 ms 4956 KB Output is correct
24 Correct 63 ms 15748 KB Output is correct
25 Correct 252 ms 22356 KB Output is correct
26 Correct 99 ms 12372 KB Output is correct
27 Correct 36 ms 5476 KB Output is correct
28 Correct 220 ms 22116 KB Output is correct
29 Correct 220 ms 22356 KB Output is correct
30 Correct 47 ms 11676 KB Output is correct

Subtask #6
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 452 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 103 ms 6056 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 220 ms 25688 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 73 ms 16088 KB Output is correct
22 Correct 15 ms 2920 KB Output is correct
23 Correct 8 ms 2192 KB Output is correct
24 Correct 62 ms 17960 KB Output is correct
25 Correct 22 ms 7260 KB Output is correct
26 Correct 26 ms 6108 KB Output is correct
27 Correct 1 ms 604 KB Output is correct
28 Correct 36 ms 7872 KB Output is correct
29 Correct 56 ms 13056 KB Output is correct
30 Correct 85 ms 19868 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 1 ms 456 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 221 ms 22356 KB Output is correct
42 Correct 42 ms 6632 KB Output is correct
43 Correct 21 ms 4956 KB Output is correct
44 Correct 63 ms 15748 KB Output is correct
45 Correct 252 ms 22356 KB Output is correct
46 Correct 99 ms 12372 KB Output is correct
47 Correct 36 ms 5476 KB Output is correct
48 Correct 220 ms 22116 KB Output is correct
49 Correct 220 ms 22356 KB Output is correct
50 Correct 47 ms 11676 KB Output is correct
51 Correct 25 ms 7288 KB Output is correct
52 Correct 247 ms 28260 KB Output is correct
53 Correct 218 ms 27988 KB Output is correct
54 Correct 57 ms 9300 KB Output is correct
55 Correct 154 ms 22228 KB Output is correct
56 Correct 69 ms 16896 KB Output is correct
57 Correct 99 ms 15832 KB Output is correct
58 Correct 248 ms 29068 KB Output is correct
59 Correct 84 ms 11860 KB Output is correct
60 Correct 105 ms 14600 KB Output is correct