제출 #403229

#제출 시각아이디문제언어결과실행 시간메모리
403229monus1042선물상자 (IOI15_boxes)C++17
100 / 100
920 ms365068 KiB
#include "boxes.h" #include <bits/stdc++.h> using namespace std; typedef long long ll; const ll inf = 8e18; const int NAX = 10000005; vector<ll> dp(NAX, inf); int maxRight = 0; ll subtwo(int N, int K, int L, int p[]){ ll answer = 0; if (L==1) return answer; int mxd = L/2; int cnt = 0, cntright = 0; for (int i=0; i<N; i++){ if (p[i] <= mxd) cnt++; if ((p[i] == 0 || p[i] >= mxd+1) && N%2==1) cntright++; else if ((p[i] == 0 || p[i] >= mxd) && N%2==0) cntright++; } if (cnt == N) return 2LL*p[N-1]; if (cntright == N) return 2LL*(L-p[0]); answer = L; ll maxleft, maxright; maxleft = maxright = 0; for (int i=0; i<N; i++){ if (p[i] <= mxd){ maxleft = max(maxleft,(ll)p[i]); }else{ maxright = max(maxright, (ll)L-p[i]); } } ll answer2 = maxleft*2LL + maxright*2LL; answer = min(answer, answer2); return answer; } ll subone(int N, int K, int L, int p[]){ ll answer = 0; for (int i=0; i<N; i++){ answer = answer + min(p[i],L-p[i])*2; } return answer; } ll subAllPoints(int N, const int K, int L, int p[]){ vector<int> ar; for (int i=0; i<N; i++){ ar.push_back(p[i]); } reverse(ar.begin(), ar.end()); while(ar.size() && ar.back() == 0) ar.pop_back(); reverse(ar.begin(), ar.end()); if (ar.empty()) return 0; vector<int> le,ri; int mxd = L/2; for (int i=0; i<ar.size(); i++){ if (ar[i] <= mxd) le.push_back(ar[i]); else ri.push_back(ar[i]); } // reverse(ri.begin(), ri.end()); vector<ll> ldp,rdp; ldp.push_back(0); rdp.push_back(0); for (int i=0; i<le.size(); i++){ ldp.push_back(-1); int cpos = i+1; int lpos = max(1,cpos-K+1); ldp[cpos] = ldp[lpos-1] + le[i]; } for (int i=0; i<ri.size(); i++){ rdp.push_back(-1); int cpos = i+1; int lpos = max(1,cpos-K+1); rdp[cpos] = rdp[lpos-1] + (L - ri[i]); } //compte dp: (go in reverse of array dp right) for (int i=(int)rdp.size()-1, helpermxR=0; i>=0; i--,helpermxR++){ int sz = (int)rdp.size()-1 - i; ll newbest = (ll)sz / K * L + rdp[i]*2; dp[helpermxR%K] = min(dp[helpermxR%K], newbest); maxRight = max(maxRight,helpermxR%K); } // compute the final answer: ll answer = inf; for (int i=0; i<ldp.size(); i++){ ll curans = ldp[i] * 2; int sz = (int)ldp.size()-1 - i; ll remaleft = (ll)((ll)sz + K-1) / K * L; curans = curans + remaleft; int complement = 0; if (sz%K) complement = K - sz%K; complement = min(complement, maxRight); ll curansRight = dp[complement]; curans = curans + curansRight; answer = min(answer, curans); } return answer; } ll delivery(int N, int K, int L, int p[]) { if (K==1) return subone(N,K,L,p); else if (K==N) return subtwo(N,K,L,p); else return subAllPoints(N,K,L,p); }

컴파일 시 표준 에러 (stderr) 메시지

boxes.cpp: In function 'll subtwo(int, int, int, int*)':
boxes.cpp:12:22: warning: unused parameter 'K' [-Wunused-parameter]
   12 | ll subtwo(int N, int K, int L, int p[]){
      |                  ~~~~^
boxes.cpp: In function 'll subone(int, int, int, int*)':
boxes.cpp:39:22: warning: unused parameter 'K' [-Wunused-parameter]
   39 | ll subone(int N, int K, int L, int p[]){
      |                  ~~~~^
boxes.cpp: In function 'll subAllPoints(int, int, int, int*)':
boxes.cpp:58:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |  for (int i=0; i<ar.size(); i++){
      |                ~^~~~~~~~~~
boxes.cpp:67:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |  for (int i=0; i<le.size(); i++){
      |                ~^~~~~~~~~~
boxes.cpp:73:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |  for (int i=0; i<ri.size(); i++){
      |                ~^~~~~~~~~~
boxes.cpp:88:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |  for (int i=0; i<ldp.size(); i++){
      |                ~^~~~~~~~~~~
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