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Submission #837599

# Submission time Handle Problem Language Result Execution time Memory
837599 2023-08-25T12:39:07 Z EntityPlantt Planine (COCI21_planine) C++17
0 / 110
 2 ms 340 KB 
#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long ll;
struct frac {
    ll x, y;
    bool operator<(const frac &f) const {
        if (y * f.y < 0) return x * f.y > y * f.x;
        return x * f.y < y * f.x;
    }
} l;
int n, h, i, c = 1, x1, y1, x2, y2, x3, y3;
pair <frac, frac> inte[500005];
int main() {
    scanf("%d%d%d%d%d%d", &n, &h, &x3, &y3, &x3, &y3);
    if (n == 3) {
        printf("0");
        return 0;
    }
    n = n / 2 - 1;
    for (i = 0; i < n; i++) {
        x1 = x3; y1 = y3;
        scanf("%d%d%d%d", &x2, &y2, &x3, &y3);
        inte[i].first = {x1 * (y1 - y2) + (h - y1) * (x1 - x2), y1 - y2};
        inte[i].second = {x2 * (y2 - y3) + (h - y2) * (x2 - x3), y2 - y3};
    }
    sort(inte, inte + n);
    l = inte[0].second;
    for (i = 1; i < n; i++) {
        if (l < inte[i].first) {
            l = inte[i].second;
            c++;
        }
    }
    printf("%d", c);
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     scanf("%d%d%d%d%d%d", &n, &h, &x3, &y3, &x3, &y3);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         scanf("%d%d%d%d", &x2, &y2, &x3, &y3);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -