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Submission #244524

# Submission time Handle Problem Language Result Execution time Memory
244524 2020-07-04T09:11:54 Z Nightlight timeismoney (balkan11_timeismoney) C++14
100 / 100
 251 ms 1548 KB 
#include <bits/stdc++.h>
#define pii pair<long double, int>
using namespace std;

int N, M, sumA, sumB;
int U[10005], V[10005];
long double T[10005], C[10005];
int stora[205][205];
int storb[205][205];
int par[205];
pii edge[10005];
bitset<10005> used;
long double MAX = 1e6;
//sumA * sumB <= K
//sumA <= K / sumB
//sumA - K / sumB <= 0

int findpar(int u) {
  return par[u] == u ? u : par[u] = findpar(par[u]);
}

int val(long double mid) {
  for(int i = 0; i < N; i++) par[i] = i;
  for(int i = 1; i <= M; i++) {
    edge[i] = make_pair(T[i] * mid + C[i] * (MAX - mid), i);
  }
  used = 0;
  sumA = 0, sumB = 0;
  sort(edge + 1, edge + M + 1);
  int u, v, id;
  long double cur;
  for(int i = 1; i <= M; i++) {
    id = edge[i].second;
    u = U[id], v = V[id];
    u = findpar(u), v = findpar(v);
    if(u == v) continue;
    par[v] = u;
    sumA += T[id];
    sumB += C[id];
    used[id] = 1;
  }
  return sumA * sumB;
}

int main() {
  scanf("%d %d", &N, &M);
  for(int i = 1; i <= M; i++) {
    cin >> U[i] >> V[i] >> T[i] >> C[i];
    stora[U[i]][V[i]] = T[i];
    storb[U[i]][V[i]] = C[i];
  }
  long double l = 1, r = MAX - 1;
  while(r - l > 1e-6) {
    long double m1 = l + (r - l) / 3;
    long double m2 = r - (r - l) / 3;
    if(val(m1) < val(m2)) {
      r = m2;
    }else {
      l = m1;
    }
  }
  val(l);
  int u, v;
  long double now;
  printf("%d %d\n", sumA, sumB);
  for(int i = 1; i <= M; i++) {
    if(used[i] == 0) continue;
    printf("%d %d\n", U[i], V[i]);
  }
  cin >> N;
}

Compilation message

timeismoney.cpp: In function 'int val(long double)':
timeismoney.cpp:31:15: warning: unused variable 'cur' [-Wunused-variable]
   long double cur;
               ^~~
timeismoney.cpp: In function 'int main()':
timeismoney.cpp:63:7: warning: unused variable 'u' [-Wunused-variable]
   int u, v;
       ^
timeismoney.cpp:63:10: warning: unused variable 'v' [-Wunused-variable]
   int u, v;
          ^
timeismoney.cpp:64:15: warning: unused variable 'now' [-Wunused-variable]
   long double now;
               ^~~
timeismoney.cpp:46:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &N, &M);
   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 640 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 12 ms 512 KB Output is correct
6 Correct 9 ms 640 KB Output is correct
7 Correct 44 ms 896 KB Output is correct
8 Correct 251 ms 1536 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 6 ms 384 KB Output is correct
13 Correct 5 ms 512 KB Output is correct
14 Correct 11 ms 640 KB Output is correct
15 Correct 9 ms 768 KB Output is correct
16 Correct 42 ms 888 KB Output is correct
17 Correct 42 ms 880 KB Output is correct
18 Correct 43 ms 888 KB Output is correct
19 Correct 240 ms 1548 KB Output is correct
20 Correct 234 ms 1536 KB Output is correct