Submission #1208694

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208694		horiaboeriu	Subway (info1cup19_subway)	C++20	100 / 100	4 ms	840 KiB

subway

#include <bits/stdc++.h>

using namespace std;

int main()
{
    //cel mai bine este ca fiecare x sa fie fiul lui x - 1, asa vor fi un nr maxim de drumuri
    int k, s, n, i;
    scanf("%d", &k);
    if (k == 0) {
        printf("1\n0 -1\n");
    } else {
        n = 1;
        while (n * (n + 1) / 2 < k) {
            n++;
        }
        s = n * (n - 1) / 2;//ultima suma < k
        n++;
        printf("%d\n0 -1\n", n);
        for (i = 1; i < n - 1; i++) {
            printf("%d %d\n", i, i - 1);
        }
        printf("%d %d\n", i, k - s - 1);
    }
    return 0;
}

Compilation message (stderr)

subway.cpp: In function 'int main()':
subway.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d", &k);
      |     ~~~~~^~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50