Submission #317064

#	Time	Username	Problem	Language	Result	Execution time	Memory
317064		daniel920712	DEL13 (info1cup18_del13)	C++14	6 / 100	8 ms	512 KiB

del13

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <queue>
#include <map>
#include <stack>

using namespace std;
int all[100005];
vector < int > tt;
int T,N,M;
stack < int > aaa;
int F(int l,int r)
{
    int x,ok=1,i,y;
    tt.clear();
    while(!aaa.empty()) aaa.pop();
    for(i=l;i<=r;i++)
    {
        if(i==0)
        {
            if(all[i]!=1) tt.push_back(all[i]-1);
        }
        else if(all[i]-all[i-1]-1) tt.push_back(all[i]-all[i-1]-1);
    }
    if(r==M-1)
    {
        if(all[r]!=N) tt.push_back(N-all[r]);
    }
    else if(all[r+1]-all[r]-1)
    {
        tt.push_back(all[r+1]-all[r]-1);
    }

    if(tt.empty()) return 1;
    if(tt.size()==1) return 0;
    x=0;
    for(auto i:tt)
    {
        x+=i;
        if(i%2==0)
        {
            if(!aaa.empty()&&aaa.top()==0) aaa.pop();
            else aaa.push(0);
        }
        else aaa.push(1);
    }
    if(x%2==1) return 0;
    if(aaa.empty()) return 1;
    x=aaa.top();
    while(!aaa.empty())
    {
        y=aaa.top();
        aaa.pop();
    }
    if(x==0||y==0) return 0;
    return 1;


}
int main()
{
    int i,j,con,xx=0,ok=1,last;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d %d",&N,&M);
        ok=1;
        last=0;
        for(i=0;i<M;i++) scanf("%d",&all[i]);
        if((N-M)%2) printf("-1\n");
        else
        {

            for(i=1;i<M;i++)
            {
                if(all[i]-all[i-1]==1)
                {
                    ok=ok&F(last,i-1);
                    last=i;
                }
            }
            ok=ok&&F(last,M-1);
            printf("%d\n",ok-1);
        }
    }

    return 0;
}

Compilation message (stderr)

del13.cpp: In function 'int F(int, int)':
del13.cpp:16:11: warning: unused variable 'ok' [-Wunused-variable]
   16 |     int x,ok=1,i,y;
      |           ^~
del13.cpp: In function 'int main()':
del13.cpp:64:11: warning: unused variable 'j' [-Wunused-variable]
   64 |     int i,j,con,xx=0,ok=1,last;
      |           ^
del13.cpp:64:13: warning: unused variable 'con' [-Wunused-variable]
   64 |     int i,j,con,xx=0,ok=1,last;
      |             ^~~
del13.cpp:64:17: warning: unused variable 'xx' [-Wunused-variable]
   64 |     int i,j,con,xx=0,ok=1,last;
      |                 ^~
del13.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   65 |     scanf("%d",&T);
      |     ~~~~~^~~~~~~~~
del13.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   68 |         scanf("%d %d",&N,&M);
      |         ~~~~~^~~~~~~~~~~~~~~
del13.cpp:71:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   71 |         for(i=0;i<M;i++) scanf("%d",&all[i]);
      |                          ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 6 / 15
• Subtask 4: 0 / 25
• Subtask 5: 0 / 30