Submission #408720

#	Time	Username	Problem	Language	Result	Execution time	Memory
408720		ly20	Inside information (BOI21_servers)	C++17	5 / 100	90 ms	3924 KiB

servers

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 121234;
int v[MAXN];
int main() {
    int n, k;
    scanf("%d %d", &n, &k);
    k += n - 1;
    for(int i = 1; i <= n; i++) v[i] = -1;
    int id = 0;
    v[1] = 0;
    id++;
    for(int i = 0; i < k; i++) {
        char c;
        scanf(" %c", &c);
        if(c == 'S') {
            int a, b;
            scanf("%d %d", &a, &b);
            if(a != 1) swap(a, b);
            v[b] = id++;
        }
        else if(c == 'Q') {
            int a, b;
            scanf("%d %d", &a, &b);
            if(a == b) printf("yes\n");
            else if(v[b] == -1 || v[a] == -1 ) printf("no\n");
            else if(v[a] > v[b] || (a == 1 && v[b] != 0)) printf("yes\n");
            else printf("no\n");
        }
        else {
            int a;
            scanf("%d", &a);
            if(v[a] == -1) printf("1\n");
            else if(a != 1) printf("%d\n", id - v[a] + 1);
            else printf("%d\n", id - v[a]);
        }
    }
}

Compilation message (stderr)

servers.cpp: In function 'int main()':
servers.cpp:7:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~
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);
      |         ~~~~~^~~~~~~~~~~
servers.cpp:18:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |             scanf("%d %d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~~
servers.cpp:24:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |             scanf("%d %d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~~
servers.cpp:32:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |             scanf("%d", &a);
      |             ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 2.5
• Subtask 2: 0 / 2.5
• Subtask 3: 2.5 / 2.5
• Subtask 4: 2.5 / 2.5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 0 / 17.5
• Subtask 12: 0 / 17.5