Submission #883443

#	Time	Username	Problem	Language	Result	Execution time	Memory
883443		catlover	Ruka (COI15_ruka)	C++14	9 / 100	2041 ms	3816 KiB

ruka

// Author : Hoang Van Tra - HSGS Bac Giang
// Train VOI 2023 - 2024

#include <bits/stdc++.h>

using namespace std;

// -------------------------------------------------------INDEF-----------------------------------------------------------------------
#define For(i, a, b) for (int i = a; i <= b; i++)
#define Ford(i, a, b) for (int i = a; i >= b; i--)
#define ll long long
#define ii pair<int, int>
#define fi first
#define se second
#define all(v) v.begin(), v.end()
#define RRH(v) v.resize(unique(all(v)) - v.begin())
const int N = 1e6 + 7;
const int M = 1e9 + 7;
const ll oo = 1e18;
const int block = 708;

int n, q;
ii a[N];

int solve() {
    int ans = 0;
    int x = 1, y = 1;
    int cur_x = 1;
    int cur_y = 1;
    For(i, 1, n) {
        x += a[i].fi;
        y += a[i].se;
        if (cur_x * x < 0) {
            ans++;
            cur_x = -cur_x;
        }
        if (cur_y * y < 0) {
            ans++;
            cur_y = -cur_y;
        }
    }

    return ans;
}

// -------------------------------------------------------ENDEF----------------------------------------------------------------------

int32_t main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

#define TASK ""
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    cin >> n;
    For(i, 1, n) cin >> a[i].fi >> a[i].se;
    cin >> q;
    a[0] = { 1, 1 };
    int pos = 1;
    while (q--) {
        char t;
        cin >> t;
        if (t == 'B')
            pos = max(1, pos - 1);
        if (t == 'F')
            pos = min(n, pos + 1);
        if (t == 'C') {
            int x, y;
            cin >> x >> y;
            a[pos] = { x, y };
        }
        if (t == 'Q')
            cout << solve() << "\n";
    }
    return 0;
}

Compilation message (stderr)

ruka.cpp: In function 'int32_t main()':
ruka.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
ruka.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
ruka.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
ruka.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 35
• Subtask 3: 0 / 56