Submission #701411

#	Time	Username	Problem	Language	Result	Execution time	Memory
701411		Do_you_copy	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1718 ms	229756 KiB

Main

#include <bits/stdc++.h>
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
#define pb push_back

using namespace std;
using ll = long long;
using pii = pair <int, int>;

const int maxN = 1e5 + 1;
const int inf = 0x3f3f3f3f;
//const int Mod =
int n;
void Init(){
    vector <pii> S;
    cin >> n;
    for (int i = 1; i <= n; ++i){
        int x, y; cin >> x >> y;
        while (!S.empty() && y - x >= S.back().se - S.back().fi) S.pop_back();
        if (!S.empty() && S.back().fi + S.back().se >= x + y) continue;
        S.pb({x, y}); continue;
    }
    cout << S.size();
}

#define taskname "test"
signed main(){
    faster
    if (fopen(taskname ".inp", "r")){
        freopen(taskname ".inp", "r", stdin);
        freopen(taskname ".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
    }
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(taskname ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lightningrod.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(taskname ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 20 / 20