Submission #64279

#TimeUsernameProblemLanguageResultExecution timeMemory
64279kingpig9Palembang Bridges (APIO15_bridge)C++11
0 / 100
4 ms724 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; #define debug(...) fprintf(stderr, __VA_ARGS__) #define fi first #define se second #define all(v) (v).begin(), (v).end() #define fillchar(a, s) memset((a), (s), sizeof(a)) bool cmp (pii p1, pii p2) { return p1.fi + p1.se < p2.fi + p2.se; } int K, N; vector<pll> A; void go (vector<ll> &vres) { set<pll> st = {pll(A[0].fi, 0), pll(A[0].se, 1)}; auto it = st.begin(); ll ans = A[0].se - A[0].fi; vres.push_back(ans); for (int i = 1; i < A.size(); i++) { ll x = A[i].fi, y = A[i].se; pll px(x, 2 * i), py(y, 2 * i + 1); st.insert(px); st.insert(py); ans += llabs(x - it->fi) + llabs(y - it->fi); if (py < *it) { it--; } else if (px > *it) { it++; } vres.push_back(ans); } } vector<ll> res[2]; int main() { scanf("%d %d", &K, &N); ll ans = 0; for (int i = 0; i < N; i++) { int x, y; char c, d; scanf(" %c %d %c %d", &c, &x, &d, &y); if (x > y) { swap(x, y); } if (c == d) { ans += y - x; } else { ans++; A.push_back({x, y}); } } if (!A.empty()) { sort(all(A), cmp); go(res[0]); if (K == 1) { printf("%lld\n", ans + res[0].back()); return 0; } reverse(all(A)); go(res[1]); ll mnadd = min(res[0].back(), res[1].back()); for (int i = 0; i + 1 < A.size(); i++) { mnadd = min(mnadd, res[0][i] + res[1][A.size() - 2 - i]); } ans += mnadd; } printf("%lld\n", ans); }

Compilation message (stderr)

bridge.cpp: In function 'void go(std::vector<long long int>&)':
bridge.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < A.size(); i++) {
                  ~~^~~~~~~~~~
bridge.cpp: In function 'int main()':
bridge.cpp:77:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i + 1 < A.size(); i++) {
                   ~~~~~~^~~~~~~~~~
bridge.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &K, &N);
  ~~~~~^~~~~~~~~~~~~~~~~
bridge.cpp:53:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c %d %c %d", &c, &x, &d, &y);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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