Submission #949849

#	Time	Username	Problem	Language	Result	Execution time	Memory
949849		Baizho	Boat (APIO16_boat)	C++14	31 / 100	1337 ms	524288 KiB

boat

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
 
// #pragma GCC optimize("Ofast,unroll-loops,fast-math")
// #pragma GCC target("popcnt,avx")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(2e7)+100;
const int M = ll(2e5) + 100;
const long long inf = 5e18;
//const long double eps = 1e-15L;
 
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
 
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
 
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }

int add(int x) {
    if(x > mod) return x - mod;
    return x;
}

int n, a[505], b[505], dp[1000005], pref[1000005];
map<int, int> pos;
 
void Baizho() {
    cin>>n;
    vector<int> vec;
    for(int i = 1; i <= n; i ++) {
        cin>>a[i]>>b[i];
        for(int j = a[i]; j <= b[i]; j ++) {
            vec.pb(j);
        }
    }
    sort(all(vec));
    vec.erase(unique(all(vec)), vec.end());
    for(int i = 0; i < vec.size(); i ++) pos[vec[i]] = i + 1;
    for(int i = 1; i <= n; i ++) {
        int from = pos[a[i]], to = pos[b[i]];
        for(int j = to; j >= from; j --) {
            dp[j] = add(dp[j] + pref[j - 1] + 1);
        }
        for(int j = from; j <= vec.size(); j ++) pref[j] = add(pref[j - 1] + dp[j]);
    }
    cout<<pref[vec.size()]<<"\n";   
}
 
signed main() {     
//  Freopen("nondec");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 
    // precalc();
    
    int ttt = 1;
   // cin>>ttt;
 
    for(int i=1; i<=ttt; i++) {Baizho(); }
}

Compilation message (stderr)

boat.cpp: In function 'void Baizho()':
boat.cpp:56:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for(int i = 0; i < vec.size(); i ++) pos[vec[i]] = i + 1;
      |                    ~~^~~~~~~~~~~~
boat.cpp:62:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         for(int j = from; j <= vec.size(); j ++) pref[j] = add(pref[j - 1] + dp[j]);
      |                           ~~^~~~~~~~~~~~~
boat.cpp: In function 'void Freopen(std::string)':
boat.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boat.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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