Language: C++

#include <bits/stdc++.h>
using namespace std;

#define rep(i,s,n) for (int i = (int)s; i < (int)n; i++)
#define ll long long
#define ld long double
#define pb push_back
#define eb emplace_back
#define All(x) x.begin(), x.end()
#define Range(x, i, j) x.begin() + i, x.begin() + j
#define lbidx(x, y) lower_bound(x.begin(), x.end(), y) - x.begin()
#define ubidx(x, y) upper_bound(x.begin(), x.end(), y) - x.begin()
#define llbidx(x, y, z) lower_bound(x.begin(), x.end(), z) - lower_bound(x.begin(), x.end(), y) // 二要素間の距離
#define deg2rad(deg) ((((double)deg)/((double)360)*2*M_PI))
#define rad2deg(rad) ((((double)rad)/(double)2/M_PI)*(double)360)
#define Find(set, element) set.find(element) != set.end()
#define Decimal(x) printf("%.10f\n", x) // 小数点を10桁まで表示
// debug用
#define PrintVec(x) for (auto elementPrintVec: x) { cout << elementPrintVec << " "; } cout << "\n";
#define debug(x) cerr << #x << ": " << (x) << "\n";
#define endl "\n"
// gcj print用
#define Case(x) printf("Case #%d: ", x);

typedef pair<int, int> PI;
typedef pair<ll, ll> PLL;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<vector<int>>> vvvi;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
typedef vector<vector<vector<int>>> vvvl;
typedef vector<PI> vpi;
typedef vector<vector<PI>> vvpi;
typedef vector<vector<vector<PI>>> vvvpi;
typedef vector<PLL> vpl;
typedef vector<vector<PLL>> vvpl;
typedef vector<vector<vector<PLL>>> vvvpl;

int POWINT(int x, int n) {
  int ret = 1;
  while (n > 0) {
    if (n & 1) ret *= x;
    x *= x;
    n >>= 1;
  }
  return ret;
};

ll POWLL(ll x, int n) {
  ll ret = 1;
  while (n > 0) {
    if (n & 1) ret *= x;
    x *= x;
    n >>= 1;
  }
  return ret;
};

template<class T>
inline bool chmax(T &a, T b) {
  if(a < b) {
    a = b;
    return true;
  }
  return false;
};

template<class T>
inline bool chmin(T &a, T b) {
  if(a > b) {
    a = b;
    return true;
  }
  return false;
};

class ORD {
  public:
  int l, r, d, base;
  ORD() {}
  ORD(int l, int r, int d): l(l), r(r), d(d) {
    base = min(l, r);
  }

  bool operator < (const ORD &ord) const {
    return base < ord.base;
  }
};


int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  map<int, int> mp;
  int N, M; cin >> N >> M;

  int l, r, d;
  vector<ORD> ords(N);
  rep(i, 0, M) {
    cin >> l >> r >> d;
    l--; r--;
    ords[i] = ORD(l, r, d);
  }

  sort(All(ords));

  bool ok = true;
  map<int, int> mp;
  rep(i, 0, N) {
    auto ord = ords[i];
    if (Find(mp, ord.l) && Find(mp, ord.r)) {
      if (mp[ord.r] - mp[ord.l] == ord.d) continue;
      else {
        ok = false;
        break;
      }
    } else if (Find(mp, ord.l)) {
      mp[ord.r] = mp[ord.l] + ord.d;
    } else if (Find(mp, ord.r)) {
      mp[ord.l] = mp[ord.r] - ord.d;
    } else {
      mp[ord.l] = 0;
      mp[ord.r] = ord.d;
    }
  }

  if (ok) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }

  return 0;
};


Compiler output:
a.cc: In function 'int main()':
a.cc:109:17: error: redeclaration of 'std::map<int, int> mp'
  109 |   map<int, int> mp;
      |                 ^~
a.cc:95:17: note: 'std::map<int, int> mp' previously declared here
   95 |   map<int, int> mp;
      |                 ^~