Submission #1069246

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069246		raduv	Fountain (eJOI20_fountain)	C++14	100 / 100	127 ms	17212 KiB

fountain

#include <stdio.h>
#include <utility>
#pragma GCC optimize("O3", "Ofast", "unroll-loops")
#pragma GCC target ("avx2")
const int MAXN = 100'000;
const int LOG = 18;
using namespace std;
int rmq[LOG + 1][MAXN + 1], cap[LOG + 1][MAXN + 1];
pair<int, int> stiva[MAXN + 1];
int ns;
int main()
{
    int n, q, i, diam, p, a, b;
    scanf("%d%d", &n, &q);
    for( i = 1; i <= n; i++ ){
      scanf("%d%d", &diam, &cap[0][i]);
      while(ns > 0 && diam > stiva[ns].first)
        rmq[0][stiva[ns--].second] = i;
      stiva[++ns] = {diam, i};
    }
    while(ns > 0)
      rmq[0][stiva[ns--].second] = i;
    for ( p = 1; p <= LOG; p++ ){
      for( i = 1; i <= n; i++ ){
        rmq[p][i] = rmq[p - 1][rmq[p - 1][i]];
        cap[p][i] = cap[p - 1][i] + cap[p - 1][rmq[p - 1][i]];
      }
    }
    while(q--){
      scanf("%d%d", &a, &b);
      for( i = LOG; i >= 0; i-- ){
        if(cap[i][a] < b){
          b -= cap[i][a];
          a = rmq[i][a];
        }
      }
      printf("%d\n", a);
    }
    return 0;
}

Compilation message (stderr)

fountain.cpp: In function 'int main()':
fountain.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
fountain.cpp:16:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |       scanf("%d%d", &diam, &cap[0][i]);
      |       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:30:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |       scanf("%d%d", &a, &b);
      |       ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40