#include <bits/stdc++.h>
#define int long long
using namespace std;
#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif
const int N = 300003;;
int n, m;
int b[N];
int p[N];
int g[N][N];
inline void minSelf(int& x, int y) {
x = min(x, y);
}
int cost[N];
inline void dij() {
priority_queue<pair<int,int>, vector<pair<int,int>>, greater<pair<int,int>>> pq;
for (int i = 0; i < n; ++i) {
cost[i] = 1e15;
}
cost[b[0]] = 0;
pq.emplace(0, b[0]);
while (!pq.empty()) {
auto src = pq.top();
pq.pop();
if (src.second == b[1]) {
cout << src.first << '\n';
exit(0);
}
if (src.first != cost[src.second]) {
continue;
}
for (int i = 0; i < n; ++i) {
if (src.first + g[src.second][i] < cost[i]) {
cost[i] = src.first + g[src.second][i];
pq.emplace(cost[i], i);
}
}
}
}
signed main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
g[i][j] = 1e15;
}
}
for (int i = 0; i < m; ++i) {
cin >> b[i] >> p[i];
for (int j = 1; j < n; ++j) {
int l = b[i] - j * p[i];
int r = b[i] + j * p[i];
if (r < n) {
minSelf(g[b[i]][r], j);
}
if (l >= 0) {
minSelf(g[b[i]][l], j);
}
}
}
dij();
cout << -1 << '\n';
return 0;
}
Compilation message
/usr/lib/gcc/x86_64-linux-gnu/10/libstdc++.a(vterminate.o): in function `__gnu_cxx::__verbose_terminate_handler()':
(.text._ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x1e): relocation truncated to fit: R_X86_64_PC32 against `.bss._ZZN9__gnu_cxx27__verbose_terminate_handlerEvE11terminating'
(.text._ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x2b): relocation truncated to fit: R_X86_64_PC32 against `.bss._ZZN9__gnu_cxx27__verbose_terminate_handlerEvE11terminating'
/usr/bin/ld: failed to convert GOTPCREL relocation; relink with --no-relax
collect2: error: ld returned 1 exit status
