Submission #1126209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126209		wibulord	Toll (BOI17_toll)	C++20	100 / 100	126 ms	88540 KiB

toll

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define pb emplace_back
#define ii pair<int, int>
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define sz(s) (int)((s).size())
#define all(a) a.begin(), a.end()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define F0R(i, b) for (int i = 0, _b = (b); i < _b; ++i)
#define FORd(i, a, b) for (int i = (a), _b = (b); i >= _b; --i)
#define F0Rd(i, b) for (int i = (b)-1; i >= 0; i--)
#define debug(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
using namespace std;

template<typename T1,typename T2> bool ckmax(T1 &x,const T2 &y){if(x<y){x=y; return 1;} return 0;}
template<typename T1,typename T2> bool ckmin(T1 &x,const T2 &y){if(y<x){x=y; return 1;} return 0;}

const int MOD = (int)1e9 + 7;
const int mod = 998244353;
const int N = 5e4 + 10, M = 18;
const int INF = (int)1e9 + 11;

/*
     /\_/\
    (= ._.)
    / >?  \>$
*/

int n, m, q, k;
int res[5][5], T[5][5];
int F[N][18][5][5];

void comb(int a[5][5], int b[5][5], int c[5][5]){
    F0R(x, k) F0R(y, k) F0R(z, k) a[x][y] = min(a[x][y], b[x][z] + c[z][y]);
}

void sol(void){
    cin >> k >> n >> m >> q;
    memset(F, 0x3f, sizeof(F));
    FOR(i, 1, m){
        int u, v, w; cin >> u >> v >> w;
        F[u/k][0][u % k][v % k] = w;
    }
    int d = (n+k-1) / k;
    FOR(j, 1, M) FOR(i, 0, d-MASK(j)) comb(F[i][j], F[i][j-1], F[i+MASK(j-1)][j-1]);
    while(q--){
        int u, v; cin >> u >> v;
        int s = u / k, t = v / k;
        memset(res, 0x3f, sizeof(res));
        F0R(i, k) res[i][i] = 0;
        F0Rd(i, M) if(s + MASK(i) <= t){
            memset(T, 0x3f, sizeof(T));
            comb(T, res, F[s][i]);
            F0R(i, k) F0R(j, k) res[i][j] = T[i][j];
            s += MASK(i);
        }
        cout << (res[u % k][v % k] > INF ? -1 : res[u % k][v % k]) << '\n';
    }
}

signed main(void){
    #define TASK "nhap"
    if(fopen(TASK".inp", "r")){
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    int t = 1;
//    cin >> t;
    while(t--) sol();
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << " ms\n";
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 8 / 8
• Subtask 4: 31 / 31
• Subtask 5: 44 / 44