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 pair<int,int> pii;
typedef pair<int,pii> pip;
#define f first
#define s second
const int maxn = 3e4+10, magic = 250, inf = 0x3f3f3f3f;
int b[maxn], p[maxn], dist1[maxn], dist2[maxn][magic+5];
vector<int> doges[maxn];
bool mark[maxn];
int main(){
ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int n, m;
cin >> n >> m;
for(int i=0; i<m; i++){
cin >> b[i] >> p[i];
doges[b[i]].push_back(i);
}
priority_queue<pip, vector<pip>, greater<pip>> fila;
memset(dist1, inf, sizeof dist1);
memset(dist2, inf, sizeof dist2);
fila.push({0, {b[0], 0}});
while(!fila.empty()){
int d = fila.top().f, u = fila.top().s.f, id = fila.top().s.s, power = p[fila.top().s.s];
fila.pop();
if(power <= magic){
if(dist2[u][power] == inf) dist2[u][power] = d;
if(u + power < n and dist2[u + power][power] == inf){
fila.push({d + 1, {u + power, id}});
dist2[u + power][power] = d + 1;
}
if(u - power >= 0 and dist2[u - power][power] == inf){
fila.push({d + 1, {u - power, id}});
dist2[u - power][power] = d + 1;
}
}
else{
if(dist1[u] == inf) dist1[u] = d;
if(!mark[id]){
mark[id] = 1;
for(int v=u+power, qtd=1; v<n; v+=power, qtd++) fila.push({d + qtd, {v, id}});
for(int v=u-power, qtd=1; v>=0; v-=power, qtd++) fila.push({d + qtd, {v, id}});
}
}
if(!doges[u].empty()){
for(auto v : doges[u]) fila.push({d, {u, v}});
doges[u].clear();
}
}
int ans = dist1[b[1]];
for(int i=1; i<=magic; i++) ans = min(ans, dist2[b[1]][i]);
cout << (ans == inf ? -1 : ans) << "\n";
return 0;
}
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