Submission #741945

#	Time	Username	Problem	Language	Result	Execution time	Memory
741945		vjudge1	Boat (APIO16_boat)	C++17	9 / 100	549 ms	2456 KiB

boat

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <bitset>
#include <cmath>
#include <queue>
#include <map>
#include <set>

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 1e6 + 100;
const ll INF = (1ll<<61);
const int MOD = 1e9 + 7;
const int inf = (1<<30);
const int maxl = 20;
const int P = 31;

int n;
int a[maxn];
int b[maxn];
int dp[550][1010];

void test(){
    cin >> n;
    vector<int> v;
    for(int i = 1; i <= n; i++){
        cin >> a[i] >> b[i];
        v.push_back(a[i]);
        v.push_back(b[i] + 1);
    }
    v.push_back(1e9 + 1);
    sort(v.begin(), v.end());
    v.resize(unique(v.begin(), v.end()) - v.begin());
    int ans = 0;
    for(int i = 1; i <= n; i++){
        for(int j = 0; j < v.size() - 1; j++){
            dp[i][j] = 1;
            for(int k = 1; k < i; k++){
                if(j) dp[i][j] = (dp[i][j] + dp[k][j-1]) % MOD;
            }
            dp[i][j] = (1ll * dp[i][j] * (v[j + 1] - v[j])) % MOD;
            if(v[j] < a[i] || v[j+1] - 1 > b[i]) dp[i][j] = 0;
            ans = (ans + dp[i][j]) % MOD;
            if(j) dp[i][j] += dp[i][j-1];
        }
    }
    cout << ans << ent;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    int t; t = 1;
    while(t--) test();
}

Compilation message (stderr)

boat.cpp: In function 'void test()':
boat.cpp:41:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for(int j = 0; j < v.size() - 1; j++){
      |                        ~~^~~~~~~~~~~~~~

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