Submission #1157586

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Source Code Expand

//start of jonathanirvings' template v3.0.3 (BETA)

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

typedef long long LL;
typedef pair<int,int> pii;
typedef pair<LL,LL> pll;
typedef pair<string,string> pss;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vii;
typedef vector<LL> vl;
typedef vector<vl> vvl;

double EPS = 1e-9;
int INF = 1000000005;
long long INFF = 1000000000000000005LL;
double PI = acos(-1);
int dirx[8] = {-1,0,0,1,-1,-1,1,1};
int diry[8] = {0,1,-1,0,-1,1,-1,1};

#ifdef TESTING
  #define DEBUG fprintf(stderr,"====TESTING====\n")
  #define VALUE(x) cerr << "The value of " << #x << " is " << x << endl
  #define debug(...) fprintf(stderr, __VA_ARGS__)
#else
  #define DEBUG 
  #define VALUE(x)
  #define debug(...)
#endif

#define FOR(a,b,c) for (int (a)=(b);(a)<(c);++(a))
#define FORN(a,b,c) for (int (a)=(b);(a)<=(c);++(a))
#define FORD(a,b,c) for (int (a)=(b);(a)>=(c);--(a))
#define FORSQ(a,b,c) for (int (a)=(b);(a)*(a)<=(c);++(a))
#define FORC(a,b,c) for (char (a)=(b);(a)<=(c);++(a))
#define FOREACH(a,b) for (auto &(a) : (b))
#define REP(i,n) FOR(i,0,n)
#define REPN(i,n) FORN(i,1,n)
#define MAX(a,b) a = max(a,b)
#define MIN(a,b) a = min(a,b)
#define SQR(x) ((LL)(x) * (x))
#define RESET(a,b) memset(a,b,sizeof(a))
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ALL(v) v.begin(),v.end()
#define ALLA(arr,sz) arr,arr+sz
#define SIZE(v) (int)v.size()
#define SORT(v) sort(ALL(v))
#define REVERSE(v) reverse(ALL(v))
#define SORTA(arr,sz) sort(ALLA(arr,sz))
#define REVERSEA(arr,sz) reverse(ALLA(arr,sz))
#define PERMUTE next_permutation
#define TC(t) while(t--)

inline string IntToString(LL a){
  char x[100];
  sprintf(x,"%lld",a); string s = x;
  return s;
}

inline LL StringToInt(string a){
  char x[100]; LL res;
  strcpy(x,a.c_str()); sscanf(x,"%lld",&res);
  return res;
}

inline string GetString(void){
  char x[1000005];
  scanf("%s",x); string s = x;
  return s;
}

inline string uppercase(string s){
  int n = SIZE(s); 
  REP(i,n) if (s[i] >= 'a' && s[i] <= 'z') s[i] = s[i] - 'a' + 'A';
  return s;
}

inline string lowercase(string s){
  int n = SIZE(s); 
  REP(i,n) if (s[i] >= 'A' && s[i] <= 'Z') s[i] = s[i] - 'A' + 'a';
  return s;
}

inline void OPEN (string s) {
  #ifndef TESTING
  freopen ((s + ".in").c_str (), "r", stdin);
  freopen ((s + ".out").c_str (), "w", stdout);
  #endif
}

//end of jonathanirvings' template v3.0.3 (BETA)

int n,m;
int a,b;
vi adj[100005];
bool done[100005];
bool bip;
int nodes;
int isol = 0;

void dfs(int now,int pt)
{
  ++nodes;
  done[now] = 1;
  REP(i,SIZE(adj[now]))
  {
    if (adj[now][i] != pt)
    {
      if (done[adj[now][i]]) bip = 1;
      else dfs(adj[now][i],now);
    }
  }
}

int main()
{
  scanf("%d %d",&n,&m);
  REP(i,n) adj[i].clear();
  TC(m)
  {
    scanf("%d %d",&a,&b);
    --a; --b;
    adj[a].pb(b);
    adj[b].pb(a);
  }
  LL risan = 0;
  int now = 0;
  int conn = 0;
  int iya = 0;
  int enggak = 0;
  REP(i,n) if (!done[i])
  {
    nodes = 0;
    bip = 0;
    dfs(i,-1);
    if (nodes == 1) ++isol;
    else
    {
      if (!bip) enggak++;
      else iya++;
      ++conn;
      now += nodes;
    }
  }
  REP(i,enggak)
  {
    risan += 2 * conn;
    --conn;
  }
  REP(i,iya)
  {
    risan += conn;
    --conn;
  }
  // risan += (LL)enggak * 2 * conn + (LL)iya * conn;
  // VALUE(enggak);
  // VALUE(iya);
  // VALUE(conn);
  // VALUE(isol);
  // VALUE(risan);
  REP(i,isol)
  {
    risan += 2 * now + 1;
    ++now;
  }
  printf("%lld\n",risan);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:122:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&n,&m);
                       ^
./Main.cpp:126:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&a,&b);
                         ^

Judge Result