Submission #758708

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
758708	2023-06-15T07:40:16 Z	Trisanu_Das	Boat (APIO16_boat)	C++17	Compilation error	0 ms	0 KB

boat

#include <bits/stdc++.h>
#define int long long
using namespace std;

const int mod=1e9+7;
int dp[1005][505], inv[505], a[505], b[505], c[1005];
set<int> s;

int f(int x, int y) {
    if (!y) return 1;
    int res=f(x, y/2);
    if (y&1) return res*res%mod*x%mod;
    else return res*res%mod;
}
signed main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n, m=0;
    cin >> n;
    for (int i=1; i<=n; i++) inv[i]=f(i, mod-2);
    for (int i=1; i<=n; i++) {
        cin >> a[i] >> b[i];
        s.insert(a[i]);
        s.insert(b[i]+1);
    }
    for (auto itr=s.begin(); itr!=s.end(); itr++) [++m]=(*itr);
    for (int i=0; i<=n; i++) dp[0][i]=1;
    for (int i=1; i<m; i++) {
        for (int j=0; j<=n; j++) {
            dp[i][j]=dp[i-1][j];
            int num=1, cnt=0;
            for (int k=1; k<=j; k++) {
                if (a[j-k+1]<=c[i] && c[i+1]-1<=b[j-k+1]) {
                    cnt++;
                    num=num*(c[i+1]-c[i]+cnt-1)%mod*inv[cnt]%mod;
                    dp[i][j]=(dp[i][j]+dp[i-1][j-k]*num)%mod;
                }
            }
        }
    }
    cout << dp[m-1][n]-1;
    return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:25:52: error: expected identifier before '++' token
   25 |     for (auto itr=s.begin(); itr!=s.end(); itr++) [++m]=(*itr);
      |                                                    ^~
boat.cpp: In lambda function:
boat.cpp:25:56: error: expected '{' before '=' token
   25 |     for (auto itr=s.begin(); itr!=s.end(); itr++) [++m]=(*itr);
      |                                                        ^
boat.cpp: In function 'int main()':
boat.cpp:25:62: error: no match for 'operator=' (operand types are 'main()::<lambda()>' and 'const long long int')
   25 |     for (auto itr=s.begin(); itr!=s.end(); itr++) [++m]=(*itr);
      |                                                              ^
boat.cpp:25:55: note: candidate: 'main()::<lambda()>& main()::<lambda()>::operator=(const main()::<lambda()>&)' (deleted)
   25 |     for (auto itr=s.begin(); itr!=s.end(); itr++) [++m]=(*itr);
      |                                                       ^
boat.cpp:25:55: note:   no known conversion for argument 1 from 'const long long int' to 'const main()::<lambda()>&'