Submission #314079

#	Time	Username	Problem	Language	Result	Execution time	Memory
314079		phathnv	Mobitel (COCI19_mobitel)	C++11	130 / 130	1581 ms	5504 KiB

mobitel

#include <bits/stdc++.h>

#define mp make_pair
#define X first
#define Y second
#define taskname "MOBITEL"

using namespace std;

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

const int R = 301;
const int sqrtN = 1001;
const int MOD = 1e9 + 7;

int r, c, n, a[R][R];
int s, dp[2][R][2][sqrtN];

void readInput(){
    scanf("%d %d %d", &r, &c, &n);
    for(int i = 1; i <= r; i++)
        for(int j = 1; j <= c; j++)
            scanf("%d", &a[i][j]);
}

void add(int &x, const int &y){
    x += y;
    x -= (x >= MOD) * MOD;
}

void nextState(int &k, int &p, int factor){
    if (k == 1){
        p = (p + factor - 1) / factor;
    } else {
        int tmp = p * factor;
        if (tmp >= s){
            k = 1;
            p = (n + tmp - 1) / tmp;
        } else {
            p = tmp;
        }
    }
}

void solve(){
    s = ceil(sqrt(n));
    dp[0][1][0][1] = 1;
    for(int i = 0; i < r; i++){
        int id = i & 1;
        for(int j = 1; j <= c; j++)
            for(int k = 0; k < 2; k++)
                for(int p = 1; p <= s; p++)
                    dp[id ^ 1][j][k][p] = 0;

        for(int j = 1; j <= c; j++)
            for(int p = 1; p <= s; p++){
                int tmp = p * a[i + 1][j];
                if (tmp < s)
                    add(dp[id ^ 1][j][0][tmp], dp[id][j][0][p]);
                else
                    add(dp[id ^ 1][j][1][(n + tmp - 1) / tmp], dp[id][j][0][p]);
                add(dp[id ^ 1][j][1][(p + a[i + 1][j] - 1) / a[i + 1][j]], dp[id][j][1][p]);
            }
        for(int j = 1; j < c; j++)
            for(int p = 1; p <= s; p++){
                int tmp = p * a[i + 1][j + 1];
                if (tmp < s)
                    add(dp[id ^ 1][j + 1][0][tmp], dp[id ^ 1][j][0][p]);
                else
                    add(dp[id ^ 1][j + 1][1][(n + tmp - 1) / tmp], dp[id ^ 1][j][0][p]);
                add(dp[id ^ 1][j + 1][1][(p + a[i + 1][j + 1] - 1) / a[i + 1][j + 1]], dp[id ^ 1][j][1][p]);
            }
    }
    printf("%d", dp[r & 1][c][1][1]);
}

int main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    readInput();
    solve();
    return 0;
}

Compilation message (stderr)

mobitel.cpp: In function 'void readInput()':
mobitel.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   21 |     scanf("%d %d %d", &r, &c, &n);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mobitel.cpp:24:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |             scanf("%d", &a[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~~
mobitel.cpp: In function 'int main()':
mobitel.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   80 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
mobitel.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".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 130 / 130