Submission #476510

#	Time	Username	Problem	Language	Result	Execution time	Memory
476510		RambaXGorilla	Global Warming (CEOI18_glo)	C++17	100 / 100	86 ms	5360 KiB

glo

#include<cstdio>
#include<climits>
#include<algorithm>
using namespace std;
int N, X;
int temps[200010];
int incSubs[200010];
int decSubs[200010];
int lengths[200010];
int main(){
    scanf("%d%d",&N,&X);
    for(int i = 0;i < N;i++){
        scanf("%d",&temps[i]);
    }
    fill(incSubs, incSubs + N, INT_MAX);
    for(int i = 0;i < N;i++){
        int pos = lower_bound(incSubs, incSubs + N, temps[i]) - incSubs;
        incSubs[pos] = temps[i];
        lengths[i] = pos + 1;
    }
    int longest = 0;
    fill(decSubs, decSubs + N, INT_MAX);
    for(int i = N - 1;i > -1;i--){
        int pos1 = lower_bound(decSubs, decSubs + N, X - temps[i]) - decSubs;
        longest = max(longest, lengths[i] + pos1);
        int pos2 = lower_bound(decSubs, decSubs + N, -temps[i]) - decSubs;
        decSubs[pos2] = -temps[i];
    }
    printf("%d",longest);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d%d",&N,&X);
      |     ~~~~~^~~~~~~~~~~~~~
glo.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         scanf("%d",&temps[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25