#include<bits/stdc++.h> using namespace std; #define fi first #define se second #define pb push_back #define eb emplace_back #define vi vector<int> #define pi pair<int,int> #define sz(v) (int)(v).size() #define all(v) (v).begin(), (v).end() #define compact(v) (v).erase(unique(all(v)), (v).end()) template<class T> using upq = priority_queue<T, vector<T>, greater<T>>; template<class T> int lwrbound(const vector<T>& a, const T& b, const int s = 0){return int(lower_bound(s + all(a), b) - a.begin());} template<class T> int uprbound(const vector<T>& a, const T& b, const int s = 0){return int(upper_bound(s + all(a), b) - a.begin());} #define FOR(i, a, b) for(int i = (a); i <= (b); i++) #define ROF(i, a, b) for(int i = (a); i >= (b); i--) #define sumof(x) accumulate(all(x), 0ll) #define dbg(x) "[" << #x " = " << (x) << "]" #define el "\n" using ll = long long; using ld = long double; template<class T> bool ckmx(T& a, const T b){return (a < b ? a = b, true : false);} template<class T> bool ckmn(T& a, const T b){return (a > b ? a = b, true : false);} const int N = 2e5 + 5; const int MOD = 1e9 + 7; const ll INF = numeric_limits<ll>::max() / 8; void Main() { int N; cin >> N; vector<vector<ll>> a(N, vector<ll>(N)); FOR(i, 0, N - 1){ FOR(j, 0, N - 1){ cin >> a[i][j]; } } vector<ll> dp(N); FOR(_, 1, N - 1){ vector<ll> ndp(N, INF); int b = 0; while(((_ - 1) >> b & 1)){ b++; } FOR(pre, 0, N - 1){ int start = (pre ^ (pre & ((1 << b) - 1)) ^ (1 << b)); FOR(x, start, start + (1 << b) - 1){ ckmn(ndp[x], dp[pre] + a[pre][x]); } } swap(ndp, dp); } cout << *min_element(all(dp)) << el; } int32_t main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define name "InvMOD" if(fopen(name".INP", "r")){ freopen(name".INP", "r", stdin); freopen(name".OUT", "w", stdout); } int t = 1; while(t--) Main(); return 0; }

Main.cpp: In function 'int32_t main()':
Main.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(name".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~