Submission #131525

#	Time	Username	Problem	Language	Result	Execution time	Memory
131525		Just_Solve_The_Problem	Pinball (JOI14_pinball)	C++11	11 / 100	2 ms	504 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[smalln][smalln];
int pos[maxn];

ll go(int i1, int i2) {
  if (b[i2] == n) return 0;
  ll &res = dp[i1][i2];
  if (res != (ll)1e18) return res;
  res = 1e18 - 1;
  for (int i = 0; i < m; i++) {
    if (i1 == i) continue;
    if (i < i1) {
      if (c[i] <= b[i2] && i < i2) {
        if (b[i] > b[i2]) {
          res = min(res, go(i1, i) + d[i]);
        } 
      }
    } else {
      if (a[i] <= c[i1] && c[i1] <= b[i]) {
        if (b[i2] > b[i]) {
          res = min(res, go(i, i2) + d[i]);
        } else {
          res = min(res, go(i, i) + d[i]);
        }
      }
    }
  }
  return res;
}

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;
  }
  // work
  for (int i = 0; i < m; i++) {
    for (int j = 0; j < m; j++) {
      dp[i][j] = 1e18;
    }
  }
  // find ans
  ll ans = 1e18;
  for (int i = 0; i < m; i++) 
    if (a[i] == 1) 
      ans = min(ans, go(i, i) + d[i]);
  
  if (ans == (ll)1e18) ans = -1;
  printf("%lld\n", ans);
}

Compilation message (stderr)

pinball.cpp:41:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
pinball.cpp: In function 'int main()':
pinball.cpp:42:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &m, &n);
   ~~~~~^~~~~~~~~~~~~~~~~
pinball.cpp:45:10: 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