Submission #699111

#	Time	Username	Problem	Language	Result	Execution time	Memory
699111		DennisTran	Lasers (NOI19_lasers)	C++17	100 / 100	434 ms	23476 KiB

lasers

#pragma GCC optimize("O2")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FOD(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) for (int i = 0; i < (n); i++)
#define ALL(x) (x).begin(), (x).end()
#define TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define ii pair <int, int>
#define fi first
#define se second
using namespace std;

const int MAXN = 5e5 + 5;

int L, R, a[MAXN], sum[MAXN];
map <int, int> mp;
void solve(void) {
    cin >> L >> R;
    FOR(i, 1, R) {
        int n; cin >> n;
        int D = L;
        FOR(i, 1, n) cin >> a[i], sum[i] = sum[i - 1] + a[i], D -= a[i];
        sum[n + 1] = L;
        FOR(i, 0, n) {
            int l = sum[i] + D + 1;
            int r = sum[i + 1];
            if (r >= l) mp[l]++, mp[r + 1]--;
            //if (r >= l) cout << l << ' ' << r << '\n';
        }
        //cout << '\n';
    }
    int ans = 0, sum = 0;
    for (auto it = mp.begin(); it != mp.end() && next(it) != mp.end(); it++) {
        sum += it -> se;
        if (sum > 0) ans += next(it) -> fi - it ->fi;
    }
    cout << ans;
}

signed main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    file("LASERS");
    //int T; cin >> T; while (T--) 
    solve();
    cerr << "Time elapsed: " << TIME << " s.\n";
    return (0 ^ 0);
}

Compilation message (stderr)

lasers.cpp: In function 'int main()':
lasers.cpp:9:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
lasers.cpp:44:5: note: in expansion of macro 'file'
   44 |     file("LASERS");
      |     ^~~~
lasers.cpp:9:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
lasers.cpp:44:5: note: in expansion of macro 'file'
   44 |     file("LASERS");
      |     ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 21 / 21
• Subtask 5: 22 / 22
• Subtask 6: 13 / 13