Submission #335389

#	Time	Username	Problem	Language	Result	Execution time	Memory
335389		doowey	Mobitel (COCI19_mobitel)	C++14	13 / 130	237 ms	65540 KiB

mobitel

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = 310;
const int L = 2100;
const int MAX = (int)1e6 + 10;
const int MOD = (int)1e9 + 7;
int A[N][N];
int idx[MAX];
vector<int> cur;
int dp[N][N][L];

void add(int &a, int b){
    a += b;
    if(a >= MOD)
        a -= MOD;
}

int main(){
    fastIO;
    int n,m,k;
    cin >> n >> m >> k;
    for(int i = 1; i <= n; i ++ ){
        for(int j = 1 ; j <= m; j ++ ){
            cin >> A[i][j];
        }
    }
    vector<int> rel;
    rel.push_back(0);
    int vl;
    for(int i = k-1; i >= 1 ; i -- ){
        vl = (k-1)/i;
        if(vl != rel.back())
            rel.push_back((k-1)/i);
    }
    for(int i = 0 ; i <= k ; i ++ ){
        idx[i] = -1;
    }
    for(int i = 0; i < rel.size(); i ++ ){
        idx[rel[i]] = i;
    }
    for(int i = 0 ; i <= k ; i ++ ){
        if(idx[i]==-1)idx[i]=idx[i-1];
    }
    dp[1][1][idx[(k-1)/A[1][1]]]=1;
    int f;
    for(int i = 1; i <= n; i ++ ){
        for(int j = 1; j <= m ; j ++ ){
            for(int c = 0; c < rel.size(); c ++ ){
                if(dp[i][j][c] == 0) continue;
                if(i + 1 <= n){
                    f = rel[c]/A[i+1][j];
                    add(dp[i+1][j][idx[f]],dp[i][j][c]);
                }
                if(j + 1 <= m){
                    f = rel[c]/A[i][j+1];
                    add(dp[i][j+1][idx[f]],dp[i][j][c]);
                }
            }
        }
    }
    cout << dp[n][m][0] << "\n";
    return 0;
}

Compilation message (stderr)

mobitel.cpp: In function 'int main()':
mobitel.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for(int i = 0; i < rel.size(); i ++ ){
      |                    ~~^~~~~~~~~~~~
mobitel.cpp:58:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |             for(int c = 0; c < rel.size(); c ++ ){
      |                            ~~^~~~~~~~~~~~

• Subtask 1: 13 / 130