Submission #1016620

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016620		ByeWorld	Lasers (NOI19_lasers)	C++14	21 / 100	1060 ms	19656 KiB

lasers

#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
#define int long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii, int> ipii;
const int MAXN = 5e5+10;
const int MAXA = 2e3+10;
const int INF = 1e18+10;
const int LOG = 19;
const int MOD = 1e9+7;
const int SQRT = 450;
const vector<int> NOL = {};
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const vector<int> dx = {1, -1, 0, 0};
const vector<int> dy = {0, 0, 1, -1};
void chmx(int &a, int b){ a = max(a, b); }

int n, num, k[MAXN];
vector <int> vec[MAXN];

signed main(){
    // ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> num;
    for(int i=1; i<=num; i++){
        cin >> k[i]; vec[i].pb(-1);
        for(int j=1; j<=k[i]; j++){
            int p; cin >> p; vec[i].pb(p);
        }
    }
    int ANS = 0;
    for(int i=1; i<=n; i++){
        int L = i-1, R = n-i;
        bool kena = 0;
        for(int j=1; j<=num; j++){
            int tot = 0, idx = 1;
            while(idx<vec[j].size() && tot+vec[j][idx] <= L){
                tot += vec[j][idx++];
            } 
            int oth = 0;
            for(int p=idx; p<vec[j].size(); p++) oth += vec[j][p];
            if(oth > R) kena = 1;
        }
        ANS += kena;
    }
    cout << ANS << '\n';
}

Compilation message (stderr)

lasers.cpp: In function 'int main()':
lasers.cpp:45:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |             while(idx<vec[j].size() && tot+vec[j][idx] <= L){
      |                   ~~~^~~~~~~~~~~~~~
lasers.cpp:49:29: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |             for(int p=idx; p<vec[j].size(); p++) oth += vec[j][p];
      |                            ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 21 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13