Submission #1224443

#	Time	Username	Problem	Language	Result	Execution time	Memory
1224443		sokratisi	Inside information (BOI21_servers)	C++20	10 / 100	51 ms	1612 KiB

servers

#include <bits/stdc++.h>

using namespace std;

int n, q, a, b;
int toleft[125000], toright[125000];
char c;

int main() {
    scanf("%d%d", &n, &q);
    for (int i = 0; i < n + q - 1; i++) {
        scanf("%c", &c); scanf("%c", &c); 
        if (c == 'S') {
            scanf("%d%d", &a, &b);
            if (a > b) swap(a, b); // so a < b
            toright[a] = toright[b] + 1;
            toleft[b] = toleft[a] + 1;
        }
        if (c == 'Q') {
            scanf("%d%d", &a, &b); // does a store b
            if (a < b) {
                if (toright[a] >= b - a) {
                    printf("yes\n");
                }
                else {
                    printf("no\n");
                }
            }
            else {
                if (toleft[a] >= a - b) {
                    printf("yes\n");
                }
                else {
                    printf("no\n");
                }
            }
        }
        if (c == 'C') {
            scanf("%d", &a);
            int l = 1, r = a;
            int leftans;
            while (l <= r) {
                int m = (l + r) / 2;
                if (toright[m] >= a - m) {
                    leftans = m;
                    r = m - 1;
                }
                else {
                    l = m + 1;
                }
            }
            l = a, r = n;
            int rightans;
            while (l <= r) {
                int m = (l + r) / 2;
                if (toleft[m] >= m - a) {
                    rightans = m;
                    l = m + 1;
                }
                else {
                    r = m - 1;
                }
            }
            printf("%d\n", rightans - leftans + 1);
        }
    }

    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:12:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         scanf("%c", &c); scanf("%c", &c);
      |         ~~~~~^~~~~~~~~~
servers.cpp:12:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         scanf("%c", &c); scanf("%c", &c);
      |                          ~~~~~^~~~~~~~~~
servers.cpp:14:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |             scanf("%d%d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~
servers.cpp:20:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |             scanf("%d%d", &a, &b); // does a store b
      |             ~~~~~^~~~~~~~~~~~~~~~
servers.cpp:39:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |             scanf("%d", &a);
      |             ~~~~~^~~~~~~~~~

• Subtask 1-1: 0 / 2
• Subtask 1-2: 0 / 3
• Subtask 2-1: 0 / 2
• Subtask 2-2: 0 / 3
• Subtask 3-1: 5 / 5
• Subtask 3-2: 5 / 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