Submission #131487

#	Time	Username	Problem	Language	Result	Execution time	Memory
131487		Just_Solve_The_Problem	Pinball (JOI14_pinball)	C++11	11 / 100	15 ms	16252 KiB

pinball

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int maxn = (int)1e5 + 7;
const int smalln = (int)1e3 + 7;

int n, m;
int a[maxn], b[maxn], c[maxn], d[maxn];
ll dp[2][smalln][smalln];
int pos[maxn];

main() {
  scanf("%d %d", &m, &n);
  iota(pos, pos + m, 0);
  for (int i = 0; i < m; i++) {
    scanf("%d %d %d %d", &a[i], &b[i], &c[i], &d[i]);
  }
  if (n >= smalln) return 0;
  if (n == 1) {
    puts("0");
    return 0;
  }
  for (int i = 0; i < smalln; i++) {
    for (int j = 0; j < smalln; j++) {
      dp[0][i][j] = dp[1][i][j] = 1e18;
    }
  }
  // work
  for (int i = 0; i < m; i++) {
    dp[0][i][i] = dp[1][i][i] = d[i];
    for (int l = 0; l < i; l++) {
      for (int r = 0; r < i; r++) {
        if (a[l] > b[r] || b[i] + 1 < a[l] || b[r] + 1 < a[i]) continue;
        if (a[i] <= c[l] && c[l] <= b[i]) {
          dp[0][i][r] = min(dp[0][i][r], dp[0][l][r] + d[i]);
          dp[1][l][i] = min(dp[1][l][i], dp[0][l][r] + d[i]);
        }
        
        if (a[i] <= c[r] && c[r] <= b[i]) {
          dp[0][i][r] = min(dp[0][i][r], dp[1][l][r] + d[i]);
          dp[1][l][i] = min(dp[1][l][i], dp[1][l][r] + d[i]);
        }
        
      }
    }
  }
  
  ll ans = 1e18;
  // find ans
  for (int i = 0; i < m; i++) {
    for (int j = 0; j < m; j++) {
      if (a[i] == 1 && b[j] == n) {
        ans = min(ans, min(dp[0][i][j], dp[1][i][j]));
      }
    }
  }
  if (ans == (ll)1e18) ans = -1;
  printf("%lld\n", ans);
}

Compilation message (stderr)

pinball.cpp:15:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
pinball.cpp: In function 'int main()':
pinball.cpp:16:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &m, &n);
   ~~~~~^~~~~~~~~~~~~~~~~
pinball.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d %d", &a[i], &b[i], &c[i], &d[i]);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49