Submission #637053

#	Time	Username	Problem	Language	Result	Execution time	Memory
637053		Dec0Dedd	DEL13 (info1cup18_del13)	C++14	0 / 100	16 ms	1620 KiB

del13

#include <bits/stdc++.h>

using namespace std;

const int N = 1e5+1;
int d[N], rm[N];

void solve() {
   int n, q; cin>>n>>q;
   for (int i=0; i<=n; ++i) d[i]=rm[i]=0;
   vector<int> v;
   for (int i=0; i<q; ++i) {
      int p; cin>>p;
      v.push_back(p);
   }
   for (int i=1; i<q; ++i) d[i]=v[i]-v[i-1]-1;

   for (int i=1; i<q-1; ++i) {
      if (d[i] <= 0) continue;
      if (d[i]%2) --d[i], --d[i+1], ++rm[i], ++rm[i+1];
      else if (rm[i] == 0) d[i]-=2, d[i+1]-=2, rm[i]+=2, rm[i+1]+=2;
   }

   bool ok=true;
   for (int i=1; i<q; ++i) {
      if ((d[i]&1) || d[i] < 0) ok=false;
      if (d[i]%2 == 0 && d[i] > 0 && rm[i] == 0) ok=false;
   }

   if (!ok) {
      cout<<-1<<"\n";
      return;
   } else {
      cout<<0<<"\n\n";
   }
}

int main() {
   int t; cin>>t;
   while (t--) solve();
}

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