Problem p00324 (C++)

Buggy submission (status: Time Limit Exceeded):
#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <stdlib.h>
#include <string>
#include <utility>
#include <vector>

#define INF 1000000000
#define MOD 1000000007
#define rep(i, a, b) for (uint32 i = (a); i < (b); ++i)
#define bitget(a, b) (((a) >> (b)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define C(x) std::cout << #x << " : " << x << std::endl
#define scanf scanf_s

using int32 = std::int_fast32_t;
using int64 = std::int_fast64_t;
using uint32 = std::uint_fast32_t;
using uint64 = std::uint_fast64_t;

template <typename T> class hashmap64 {
  std::vector<std::pair<uint64, T>> map;
  uint64 mask, count, temp;
  uint64 hash64(uint64 key) {
    key = ~key;
    key ^= key << 13;
    key ^= key >> 19;
    return key ^ (key << 17);
  }

public:
  hashmap64()
      : map(8192, std::make_pair(~static_cast<std::uint_fast64_t>(0), T())) {
    mask = 8191;
    count = 0;
  }
  hashmap64(size_t s) {
    s |= s << 1;
    s |= s >> 2;
    s |= s >> 4;
    s |= s >> 8;
    s |= s >> 16;
    s |= s >> 32;
    mask = s;
    count = 0;
    map.resize(s + 1, std::make_pair(~static_cast<std::uint_fast64_t>(0), T()));
  }
  T &operator[](uint64 suf) {
    temp = mask & hash64(suf);
    while (map[temp].first != suf) {
      temp = mask & (temp + 1);
    }
    return map[temp].second;
  }
  void insert(uint64 key, const T &value) {
    temp = mask & hash64(key);
    while (~map[temp].first) {
      if (map[temp].first == key) {
        map[temp].second = value;
        return;
      }
      temp = mask & (temp + 1);
    }
    map[temp] = std::make_pair(key, value);
    ++count;
    if ((count << 1) > mask) {
      std::pair<uint64, T> mkey;
      mask = mask << 1 | 1;
      map.resize(mask + 1,
                 std::make_pair(~static_cast<std::uint_fast64_t>(0), T()));
      for (uint64 t = 0; t <= mask >> 1; ++t) {
        if (!~map[t].first) {
          mkey = map[t];
          map[t].first = ~0;
          temp = mask & hash64(mkey.first);
          while (~map[temp].first) {
            temp = mask & (temp + 1);
          }
          map[temp] = mkey;
        }
      }
    }
    return;
  }
  bool find(uint64 key) {
    temp = mask & hash64(key);
    while (~map[temp].first) {
      if (map[temp].first == key) {
        return true;
      }
      temp = mask & (temp + 1);
    }
    return false;
  }
  bool empty(void) { return !count; }
  size_t size(void) { return count; }
};

int main(void) {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  hashmap64<uint32> map(16000);
  uint32 n;
  std::cin >> n;
  int64 a, sum = 1e15;
  uint32 ans = 0;
  map.insert(sum, 0);
  rep(i, 0, n) {
    std::cin >> a;
    sum += a;
    if (map.find(sum)) {
      ans = std::max(ans, i + 1 - map[sum]);
    } else {
      map.insert(sum, i + 1);
    }
  }
  std::cout << ans << "\n";
  return 0;
}

Fixed submission:
#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <stdlib.h>
#include <string>
#include <utility>
#include <vector>

#define INF 1000000000
#define MOD 1000000007
#define rep(i, a, b) for (uint32 i = (a); i < (b); ++i)
#define bitget(a, b) (((a) >> (b)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define C(x) std::cout << #x << " : " << x << std::endl
#define scanf scanf_s

using int32 = std::int_fast32_t;
using int64 = std::int_fast64_t;
using uint32 = std::uint_fast32_t;
using uint64 = std::uint_fast64_t;

template <typename T> class hashmap64 {
  std::vector<std::pair<uint64, T>> map;
  uint64 mask, count, temp;
  uint64 hash64(uint64 key) {
    key = ~key;
    key ^= key << 13;
    key ^= key >> 19;
    return key ^ (key << 17);
  }

public:
  hashmap64()
      : map(8192, std::make_pair(~static_cast<std::uint_fast64_t>(0), T())) {
    mask = 8191;
    count = 0;
  }
  hashmap64(size_t s) {
    s |= s << 1;
    s |= s >> 2;
    s |= s >> 4;
    s |= s >> 8;
    s |= s >> 16;
    s |= s >> 32;
    mask = s;
    count = 0;
    map.resize(s + 1, std::make_pair(~static_cast<std::uint_fast64_t>(0), T()));
  }
  T &operator[](uint64 suf) {
    temp = mask & hash64(suf);
    while (map[temp].first != suf) {
      temp = mask & (temp + 1);
    }
    return map[temp].second;
  }
  void insert(uint64 key, const T &value) {
    temp = mask & hash64(key);
    while (~map[temp].first) {
      if (map[temp].first == key) {
        map[temp].second = value;
        return;
      }
      temp = mask & (temp + 1);
    }
    map[temp] = std::make_pair(key, value);
    ++count;
    if ((count << 1) > mask) {
      std::pair<uint64, T> mkey;
      mask = mask << 1 | 1;
      map.resize(mask + 1,
                 std::make_pair(~static_cast<std::uint_fast64_t>(0), T()));
      for (uint64 t = 0; t <= mask >> 1; ++t) {
        if (!~map[t].first) {
          mkey = map[t];
          map[t].first = ~0;
          temp = mask & hash64(mkey.first);
          while (~map[temp].first) {
            temp = mask & (temp + 1);
          }
          map[temp] = mkey;
        }
      }
    }
    return;
  }
  bool find(uint64 key) {
    temp = mask & hash64(key);
    while (~map[temp].first) {
      if (map[temp].first == key) {
        return true;
      }
      temp = mask & (temp + 1);
    }
    return false;
  }
  bool empty(void) { return !count; }
  size_t size(void) { return count; }
};

int main(void) {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  hashmap64<uint32> map(32000);
  uint32 n;
  std::cin >> n;
  int64 a, sum = 1e15;
  uint32 ans = 0;
  map.insert(sum, 0);
  rep(i, 0, n) {
    std::cin >> a;
    sum += a;
    if (map.find(sum)) {
      ans = std::max(ans, i + 1 - map[sum]);
    } else {
      map.insert(sum, i + 1);
    }
  }
  std::cout << ans << "\n";
  return 0;
}