이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
//const int N = 3e4 + 30, B = 175;
const int N = 2020;
const int inf = 2e9;
vector<int> g[N];
int n, m;
//int dist[N][B];
int dist[N][N];
bool bio[N];
/*
5 3
0 2
1 1
4 1
*/
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
for(int i = 0; i < N; i++) {
for(int j = 0; j < N; j++) {
//for(int j = 0; j < B; j++) {
dist[i][j] = inf;
}
}
cin >> n >> m;
int s = 0, f = 0;
for(int i = 0; i < m; i++) {
int x, k;
cin >> x >> k;
g[x].push_back(k);
if(i == 0) s = x;
if(i == 1) f = x;
}
priority_queue<array<int,3>> pq;
for(auto x : g[s]) {
// if(x < B) {
dist[s][x] = 0;
pq.push({dist[s][x], s, x});
// } else {
// for(int k = 1; s + k * x < N; k++) {
// dist[s + k * x][0] = k;
// pq.push({-dist[s + k * x][0], s + k * x, 0});
// }
//
// for(int k = 1; s - k * x >= 0; k++) {
// dist[s - k * x][0] = k;
// pq.push({-dist[s - k * x][0], s - k * x, 0});
// }
// }
}
bio[s] = 1;
while(!pq.empty()) {
auto top = pq.top();
int d = get<0>(top);
int v = get<1>(top);
int p = get<2>(top);
pq.pop();
d = -d;
if(d > dist[v][p]) continue;
if(!bio[v]) {
for(auto x : g[v]) {
// if(x < B) {
dist[v][x] = d;
pq.push({-dist[v][x], v, x});
// } else {
// for(int k = 1; v + k * x < n; k++) {
// if(dist[v + k * x][0] > d + k) {
// dist[v + k * x][0] = d + k;
// pq.push({-dist[v + k * x][0], v + k * x, 0});
// }
// }
//
// for(int k = 1; v - k * x >= 0; k++) {
// if(dist[v - k * x][0] > d + k) {
// dist[v - k * x][0] = d + k;
// pq.push({-dist[v - k * x][0], v - k * x, 0});
// }
// }
// }
}
bio[v] = 1;
}
if(v + p < N && dist[v + p][p] > d + 1) {
dist[v + p][p] = d + 1;
pq.push({-dist[v + p][p], v + p, p});
}
if(v - p >= 0 && dist[v - p][p] > d + 1) {
dist[v - p][p] = d + 1;
pq.push({-dist[v - p][p], v - p, p});
}
}
int ans = inf;
//for(int k = 0; k < B; k++)
for(int k = 0; k < N; k++)
ans = min(ans, dist[f][k]);
if(ans == inf)
ans = -1;
cout << ans << '\n';
return 0;
}
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