Submission #1007699

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007699		devariaota	Lasers (NOI19_lasers)	C++17	100 / 100	143 ms	15696 KiB

lasers

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pb push_back
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
bool ckmin(int& a, int b){return b < a ? a = b, 1 : 0;}
bool ckmax(int& a, int b){return b > a ? a = b, 1 : 0;}
const int N = 2e5 + 5, mod = 1e9 + 7;

signed main(){
    ios_base::sync_with_stdio(0), cin.tie(0);
    int n, q; cin >> n >> q;
    set<pii> st;
    while(q--) {
        int k, s = 0; cin >> k;
        vector<int> v(k);
        int r = n, id = 0;
        for(int i = 0; i < k; i++) {
            cin >> v[i];
            s += v[i];
        }
        int ll = 0, l = n - s + 1;
        int rl = -1, rh = -1;
        for(int i = 0; i < k; i++) {
            ll += v[i];
            if(ll >= l) st.insert({l, ll});
            // cout << i << " " << ll << " " << l << endl;
            l += v[i];
        }
    }
    // for(auto i : st) cout << i.fi << " " << i.se << endl;
    int l = -1, r = -1, ans = 0;
    for(auto i : st) {
        if(l == -1) ans += i.se - i.fi + 1, l = i.se + 1;
        else if(i.se >= l) {
            l = max(l, i.fi);
            ans += i.se - l + 1;
            l = i.se + 1;
        }
    }
    cout << ans << endl;
}

Compilation message (stderr)

lasers.cpp: In function 'int main()':
lasers.cpp:20:13: warning: unused variable 'r' [-Wunused-variable]
   20 |         int r = n, id = 0;
      |             ^
lasers.cpp:20:20: warning: unused variable 'id' [-Wunused-variable]
   20 |         int r = n, id = 0;
      |                    ^~
lasers.cpp:26:13: warning: unused variable 'rl' [-Wunused-variable]
   26 |         int rl = -1, rh = -1;
      |             ^~
lasers.cpp:26:22: warning: unused variable 'rh' [-Wunused-variable]
   26 |         int rl = -1, rh = -1;
      |                      ^~
lasers.cpp:35:17: warning: unused variable 'r' [-Wunused-variable]
   35 |     int l = -1, r = -1, ans = 0;
      |                 ^

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