Submission #1224487

#	Time	Username	Problem	Language	Result	Execution time	Memory
1224487		sokratisi	Inside information (BOI21_servers)	C++20	2 / 100	44 ms	1096 KiB

servers

#include <bits/stdc++.h>

using namespace std;

int n, q, a, b;
char c;
int table[125000]; // what time did thing connecting 1 and b come

int main() {
    scanf("%d%d", &n, &q);
    for (int i = 1; i <= n; i++) table[i] = INT_MAX;
    table[1] = -1;
    int cnt = 0;
    for (int i = 0; i < n + q - 1; i++) {
        scanf("%c", &c); scanf("%c", &c);
        if (c == 'S') {
            scanf("%d%d", &a, &b);
            table[max(a, b)] = cnt++;
        }
        if (c == 'Q') {
            scanf("%d%d", &a, &b); // does a have b
            // iff d came before a
            if (b == 1) {
                if (table[a] != INT_MAX) printf("yes\n");
                else printf("no\n"); 
                continue;
            }
            if (a == 1) {
                if (table[b] != INT_MAX) printf("yes\n");
                else printf("no\n");
                continue;
            }
            if (table[b] <= table[a] && table[a] != INT_MAX) printf("yes\n");
            else printf("no\n");
        }
        if (c == 'C') {
            scanf("%d", &a);
            if (a == 1) {
                printf("%d\n", cnt+1);
            }
            else if (table[a] == INT_MAX) {
                printf("1\n");
            }
            else {
                printf("%d\n", table[a]+2);
            }
        }
    }

    return 0;
}

Compilation message (stderr)

servers.cpp: In function 'int main()':
servers.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
servers.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%c", &c); scanf("%c", &c);
      |         ~~~~~^~~~~~~~~~
servers.cpp:15:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%c", &c); scanf("%c", &c);
      |                          ~~~~~^~~~~~~~~~
servers.cpp:17:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |             scanf("%d%d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~
servers.cpp:21:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |             scanf("%d%d", &a, &b); // does a have b
      |             ~~~~~^~~~~~~~~~~~~~~~
servers.cpp:37:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |             scanf("%d", &a);
      |             ~~~~~^~~~~~~~~~

• Subtask 1-1: 0 / 2
• Subtask 1-2: 0 / 3
• Subtask 2-1: 2 / 2
• Subtask 2-2: 0 / 3
• Subtask 3-1: 0 / 5
• Subtask 3-2: 0 / 5
• Subtask 4-1: 0 / 10
• Subtask 4-2: 0 / 10
• Subtask 5-1: 0 / 12
• Subtask 5-2: 0 / 13
• Subtask 6-1: 0 / 17
• Subtask 6-2: 0 / 18