Submission #61187

#	Time	Username	Problem	Language	Result	Execution time	Memory
61187		dukati8	Boat (APIO16_boat)	C++14	9 / 100	2084 ms	525312 KiB

boat

#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for (int i=a; i<int(b); i++)
long long m=1e9+7;
int main() {
  int n;
  cin >> n;
  vector<long long> a(n);
  vector<long long> b(n);
  rep(i,0,n) {
    cin >> a[i] >> b[i];
  }
  unordered_map<long long, long long> x;
  x[0]=1;
  rep (i,0,n) {
    long long lo,hi;
    lo=a[i];
    hi=b[i];
    long long sum=0;
    vector<pair<long long, long long>> save;
    for (auto c:x) {

      long long size=c.first;
      long long num=c.second;
      //cout << size << " " << num <<  endl;
      if (size<lo) {sum+=num; sum%=m;}
      else if (size<hi) save.push_back(c);
    }
    //cout << endl;
    sort(save.begin(),save.end());
    long long j=0;
    rep (i,lo,hi+1) {
      while(j<save.size() &&save[j].first<i) {
        sum+=save[j].second;
        sum&=m;
        j++;
      }
      if (x.find(i)==x.end()) {
        x[i]=sum;
      }
      else {
        x[i]+=sum;
        x[i]%=m;
      }
    }
  }
  long long sum=0;
  for (auto c:x){
    sum+=c.second;
    sum%=m;
    //cout << c.first << " " << c.second << endl;
  }
  sum+=m;
  sum-=1;
  sum%=m;
  cout << sum << endl;


}

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:34:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       while(j<save.size() &&save[j].first<i) {
             ~^~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42