Submission #209115

#	Time	Username	Problem	Language	Result	Execution time	Memory
209115		Sensei	Zamjene (COCI16_zamjene)	C++14	28 / 140	2200 ms	136912 KiB

zamjene

/*
	DATE:		2020-03-13 10:51:02
	NAME:		
	PROBLEM:	COCI16_ZAMJENE
*/
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1e6;

const long long MOD = 1e9 + 7;
const int prime = 67;

long long add(long long x, long long y) {
  return ((x % MOD) + (y % MOD)) % MOD;
}

long long sub(long long x, long long y) {
  return ((x % MOD) + MOD - (y % MOD)) % MOD;
}

long long mul(long long x, long long y) {
  return ((x % MOD) * (y % MOD)) % MOD;
}

long long liftt[MAXN + 7];

long long lift(int x) {
  return liftt[x];
}

int p[MAXN + 7];
int q[MAXN + 7];

int par[MAXN + 7];
int r[MAXN + 7];
long long P[MAXN + 7];
long long Q[MAXN + 7];

unordered_map<long long, int> cnt;

long long ans_for_4 = 0;

void ins(int x, int y) {
  // cerr << "ins: " << x << " " << y << " " << p[y] << "\n";
  long long t = sub(P[x], Q[x]);
  // cerr << t << "\t" << cnt[t] << "\t" << cnt[-t] << "\n";
  if (t != 0) {
    ans_for_4 -= r[x] * cnt[sub(0, t)];
  }
  cnt[t] -= r[x];
  
  P[x] = add(P[x], lift(p[y]));

  t = sub(P[x], Q[x]);
  if (t != 0) {
    ans_for_4 += r[x] * cnt[sub(0, t)];
  }
  cnt[t] += r[x];
  // cerr << t << "\t" << cnt[t] << "\t" << cnt[-t] << "\n";
}

void del(int x, int y) {
  long long t = sub(P[x], Q[x]);
  if (t != 0) {
    ans_for_4 -= r[x] * cnt[sub(0, t)];
  }
  cnt[t] -= r[x];
  
  P[x] = sub(P[x], lift(p[y]));

  t = sub(P[x], Q[x]);
  if (t != 0) {
    ans_for_4 += r[x] * cnt[sub(0, t)];
  }
  cnt[t] += r[x];
}

void makeset(int x) {
  par[x] = x;
  r[x] = 1;
  Q[x] = lift(q[x]);
  P[x] = 0;
  cnt[sub(P[x], Q[x])] += r[x];
  ins(x, x);
}

int findset(int x) {
  if (par[x] != x) {
    par[x] = findset(par[x]);
  }
  return par[x];
}

void link(int x, int y) {
  x = findset(x);
  y = findset(y);
  if (x == y) {
    return;
  }

  if (r[x] > r[y]) {
    par[y] = x;

    long long t = sub(P[x], Q[x]);
    if (t != 0) {
      ans_for_4 -= r[x] * cnt[sub(0, t)];
    }
    cnt[sub(P[x], Q[x])] -= r[x];

    t = sub(P[y], Q[y]);
    if (t != 0) {
      ans_for_4 -= r[y] * cnt[sub(0, t)];
    }
    cnt[sub(P[y], Q[y])] -= r[y];

    P[x] = add(P[x], P[y]);
    Q[x] = add(Q[x], Q[y]);
    r[x] += r[y];

    t = sub(P[x], Q[x]);
    if (t != 0) {
      ans_for_4 += r[x] * cnt[sub(0, t)];
    }
    cnt[sub(P[x], Q[x])] += r[x];
  }
  else {
    par[x] = y;

    long long t = sub(P[x], Q[x]);
    if (t != 0) {
      ans_for_4 -= r[x] * cnt[sub(0, t)];
    }
    cnt[sub(P[x], Q[x])] -= r[x];

    t = sub(P[y], Q[y]);
    if (t != 0) {
      ans_for_4 -= r[y] * cnt[sub(0, t)];
    }
    cnt[sub(P[y], Q[y])] -= r[y];

    P[y] = add(P[y], P[x]);
    Q[y] = add(Q[y], Q[x]);
    r[y] += r[x];

    t = sub(P[y], Q[y]);
    if (t != 0) {
      ans_for_4 += r[y] * cnt[sub(0, t)];
    }
    cnt[sub(P[y], Q[y])] += r[y];
  }
}

int main() {
  liftt[0] = 1;
  for (int i = 1; i <= MAXN; i++) {
    liftt[i] = mul(liftt[i - 1], prime);
  }

  int n, qry;
  cin >> n >> qry;

  for (int i = 1; i <= n; i++) {
    scanf("%d", &p[i]);
    q[i] = p[i];
  }

  sort(q + 1, q + n + 1);

  for (int i = 1; i <= n; i++) {
    makeset(i);
  }

  int ccnt = n;

  while (qry--) {
    // for (unordered_map<long long, int>::iterator it = cnt.begin(); it != cnt.end(); it++) {
    //   cerr << it->first << " " << it->second << "\n";
    // }
    int ty;
    scanf("%d", &ty);
    if (ty == 1) {
      int a, b;
      scanf("%d %d", &a, &b);
      int x = findset(a);
      int y = findset(b);
      if (x == y) {
        continue;
      }
      
      del(x, a);
      ins(x, b);
      del(y, b);
      ins(y, a);
      swap(p[a], p[b]);
    }
    else if (ty == 2) {
      int a, b;
      scanf("%d %d", &a, &b);
      if (findset(a) != findset(b)) {
        ccnt--;
      }
      link(a, b);
    }
    else if (ty == 3) {
      if (cnt[0] == n) {
        printf("DA\n");
      }
      else {
        printf("NE\n");
      }
    }
    else if (ty == 4) {
      printf("%lld\n", ans_for_4);
    }
  }

  return 0;
}

Compilation message (stderr)

zamjene.cpp: In function 'int main()':
zamjene.cpp:165:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &p[i]);
     ~~~~~^~~~~~~~~~~~~
zamjene.cpp:182:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &ty);
     ~~~~~^~~~~~~~~~~
zamjene.cpp:185:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d %d", &a, &b);
       ~~~~~^~~~~~~~~~~~~~~~~
zamjene.cpp:200:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d %d", &a, &b);
       ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
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• Subtask 10: 0 / 14