Submission #1116774

#TimeUsernameProblemLanguageResultExecution timeMemory
1116774SalihSahinShortcut (IOI16_shortcut)C++14
0 / 100
1 ms336 KiB
#include <bits/stdc++.h> #define pb push_back using namespace std; #include "shortcut.h" long long inf = 1e16; long long find_shortcut(int n, vector<int> l, vector<int> d, int c){ vector<long long> pre(n); for(int i = 0; i < n-1; i++){ pre[i+1] = pre[i] + l[i]; } vector<long long> lfar(n), rfar(n); lfar[0] = d[0]; for(int i = 1; i < n; i++){ if(d[i] > lfar[i-1] + l[i-1]) lfar[i] = d[i]; else lfar[i] = lfar[i-1] + l[i-1]; } rfar[n-1] = d[n-1]; for(int i = n-2; i >= 0; i--){ if(d[i] > rfar[i+1] + l[i]) rfar[i] = d[i]; else rfar[i] = rfar[i+1] + l[i]; } vector<long long> precalcl(n), precalcr(n); for(int i = 1; i < n; i++){ precalcl[i] = max(precalcl[i-1], (long long)(lfar[i-1] + l[i-1] + d[i])); } for(int i = n-2; i >= 0; i--){ precalcr[i] = max(precalcr[i+1], (long long)(rfar[i+1] + l[i] + d[i])); } long long ans = inf; for(int l = 0; l < n; l++){ long long maxla = precalcl[l]; int r; int L = l+1, R = n-1; while(L < R){ int M = (L + R)/2; if(M >= n && M <= l) break; r = M; long long dis1 = 0, dis2 = 0; dis1 = max(dis1, precalcr[r]); // R-R dis1 = lfar[l] + rfar[r] + min((long long)c, pre[r] - pre[l]); // L-R long long clen = pre[r] - pre[l] + c; for(int j = l+1; j <= r; j++){ dis2 = max(dis2, lfar[l] + (long long)d[j] + min(pre[j] - pre[l], clen - (pre[j] - pre[l]))); } // L-M for(int j = l; j < r; j++){ dis2 = max(dis2, rfar[r] + (long long)d[j] + min(pre[r] - pre[j], clen - (pre[r] - pre[j]))); } // R-M for(int j = l+1; j < r; j++){ // M-M long long addj = d[j]; for(int j2 = j+1; j2 < r; j2++){ long long addj2 = d[j2]; dis2 = max(dis2, min(pre[j2] - pre[j], clen - (pre[j2] - pre[j])) + addj + addj2); } } ans = min(ans, max({maxla, dis1, dis2})); if(dis1 >= dis2) L = M + 1; else R = M; } if(L >= n && L <= l) continue; r = L; long long dis1 = 0, dis2 = 0; dis1 = max(dis1, precalcr[r]); // R-R dis1 = lfar[l] + rfar[r] + min((long long)c, pre[r] - pre[l]); // L-R long long clen = pre[r] - pre[l] + c; for(int j = l+1; j <= r; j++){ dis2 = max(dis2, lfar[l] + (long long)d[j] + min(pre[j] - pre[l], clen - (pre[j] - pre[l]))); } // L-M for(int j = l; j < r; j++){ dis2 = max(dis2, rfar[r] + (long long)d[j] + min(pre[r] - pre[j], clen - (pre[r] - pre[j]))); } // R-M for(int j = l+1; j < r; j++){ // M-M long long addj = d[j]; for(int j2 = j+1; j2 < r; j2++){ long long addj2 = d[j2]; dis2 = max(dis2, min(pre[j2] - pre[j], clen - (pre[j2] - pre[j])) + addj + addj2); } } ans = min(ans, max({maxla, dis1, dis2})); } return ans; }
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