Submission #592126

#	Time	Username	Problem	Language	Result	Execution time	Memory
592126		Do_you_copy	Boat (APIO16_boat)	C++17	0 / 100	1 ms	468 KiB

boat

#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
using ull = unsigned ll;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

const ll Mod = 1000000009;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 5e2 + 1;

int n;
ll bit[maxN * 2];
vector <int> v;

struct TBoat{
    int l, r;
};
TBoat a[maxN];
ll dp[maxN * 2];

ll update(int x, ll val){
    for (; x <= v.size(); x += x & -x){
        bit[x] += val;
        bit[x] %= Mod;
    }
}

ll get(int x){
    ll ans = 0;
    for (; x; x -= x & -x){
        ans += bit[x];
        ans %= Mod;
    }
    return ans;
}

void Init(){
    cin >> n;
    for (int i = 1; i <= n; ++i){
        cin >> a[i].l >> a[i].r;
        v.pb(a[i].l);
        v.pb(a[i].r);
    }
    sort(v.begin(), v.end());
    v.resize(unique(v.begin(), v.end()) - v.begin());
    for (int i = 1; i <= n; ++i){
        int from = lower_bound(v.begin(), v.end(), a[i].l) - v.begin();
        int to = lower_bound(v.begin(), v.end(), a[i].r) - v.begin();
        for (int j = from; j < to; ++j){
            dp[j] = (get(j) + 1) * (v[j + 1] - v[j]) % Mod;
        }
        dp[to] = get(to + 1) + 1;
        for (int j = from; j <= to; ++j){
            update(j + 1, dp[j]);
        }
    }
    cerr << get(v.size());
}


int main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        //freopen(taskname".out", "w", stdout);
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
}

Compilation message (stderr)

boat.cpp: In function 'll update(int, ll)':
boat.cpp:40:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for (; x <= v.size(); x += x & -x){
      |            ~~^~~~~~~~~~~
boat.cpp:44:1: warning: no return statement in function returning non-void [-Wreturn-type]
   44 | }
      | ^
boat.cpp: In function 'int main()':
boat.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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