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Submission #1088485

# Submission time Handle Problem Language Result Execution time Memory
1088485 2024-09-14T13:55:21 Z Sunbae Palembang Bridges (APIO15_bridge) C++17
22 / 100
 35 ms 3416 KB 
#include <bits/stdc++.h>
#define mp make_pair
#define F first
#define S second
typedef long long ll;
using namespace std;
using pii = pair<int,int>;
const int N = 1e5 + 5, M = 2e5 + 5;
int a[M], m, cp[M], to_rem[N];
bool ok[N];
ll bit[2][M];
pii P[N], V[M];
int pos(int x){ return upper_bound(cp, cp+m, x) - cp;}
ll upd(int x, int i, ll val){ for(; i<M; i+=i&-i) bit[x][i] += val;}
ll qry(int x, int i){ ll res = 0; for(; i; i-=i&-i) res += bit[x][i]; return res;}
int _find(int k){
	int sum = 0, i = 0;
	for(int j = 18; j>=0; --j){
		if(i+(1<<j) < M && sum + bit[0][i+(1<<j)] < k) sum += bit[0][i+=(1<<j)];
	}
	return i + 1;
}

signed main(){
	int k, n; m = 0; scanf("%d %d", &k, &n);
	if(k == 1){
		ll tot = 0; char c[2];
		for(int i = 0, p[2]; i<n; ++i){
			scanf(" %c %d %c %d", c, p, c+1, p+1); if(p[0] > p[1]) swap(p[0], p[1]);
			if(c[0] == c[1]) tot += p[1] - p[0];
			else{ a[m++] = p[0]; a[m++] = p[1];}
		}
		sort(a, a+m);
		for(int i = 0; i<m; ++i) tot += abs(a[i] - a[m/2 - 1]);
		printf("%lld", tot + m/2);
	}else{
		ll tot = 0, sum[2] = {0, 0};
		for(int i = 0, p[2]; i<n; ++i){
			char c[2]; 
			scanf(" %c %d %c %d", c, p, c+1, p+1); if(p[0] > p[1]) swap(p[0], p[1]);
			if(c[0] == c[1]) tot += p[1] - p[0];
			else{
				cp[m] = p[0]; V[m++] = mp(p[0], i);
				cp[m] = p[1]; V[m++] = mp(p[1], i);
				P[i] = mp(p[0], p[1]);
				ok[i] = true;
				++tot;
			}
		}
		int sz = m, cnt = 0;
		sort(cp, cp+m); m = unique(cp, cp+m) - cp;
		sort(V, V+sz);
		for(int i = 0; i<n; ++i){
			if(ok[i]){
				int idx[2] = {pos(P[i].F), pos(P[i].S)};
				upd(0, idx[0], +1); upd(0, idx[1], +1);
				upd(1, idx[0], +P[i].F); upd(1, idx[1], +P[i].S);
				cnt += 2;
			}
		}
		int I = _find((cnt+1)/2);
		ll fp = qry(0, I) * cp[I-1] - qry(1, I);
		ll sp = (qry(1, M-1) - qry(1, I)) - (qry(0, M-1) - qry(0, I)) * cp[I-1];
		ll md = fp + sp, not_md = 0, mn = 2e18;
		set<int> s;
		for(int i = 0, j; i<sz; ){
			int t = 0;
			for(j = i; V[j].F == V[i].F; ++j){
				if(s.find(V[j].S) == s.end()){
					s.insert(V[j].S);
					int idx[2] = {pos(P[V[j].S].F), pos(P[V[j].S].S)};
					upd(0, idx[0], -1); upd(0, idx[1], -1); 
					upd(1, idx[0], -P[i].F); upd(1, idx[1], -P[i].S);
					cnt -= 2;
					not_md += P[V[j].S].S - P[V[j].S].F;
				}else{
					to_rem[t++] = V[j].S;
				}
				
			}
			//
			I = _find((cnt+1)/2);
			fp = qry(0, I) * cp[I-1] - qry(1, I);
			sp = (qry(1, M-1) - qry(1, I)) - (qry(0, M-1) - qry(0, I)) * cp[I-1];
			md = fp + sp;
			mn = min(mn, md + not_md);
			//
			for(int w = 0; w<t; ++w){
				s.erase(to_rem[w]);
				int idx[2] = {pos(P[to_rem[j]].F), pos(P[to_rem[j]].S)};
				upd(0, idx[0], +1); upd(0, idx[1], +1); 
				upd(1, idx[0], +P[i].F); upd(1, idx[1], +P[i].S);
				cnt += 2;
				not_md -= P[to_rem[w]].S - P[to_rem[w]].F;
			}
			//
			i = j;
		}
		printf("%lld", tot + cnt * mn);
	}
}

Compilation message

bridge.cpp: In function 'll upd(int, int, ll)':
bridge.cpp:14:68: warning: no return statement in function returning non-void [-Wreturn-type]
   14 | ll upd(int x, int i, ll val){ for(; i<M; i+=i&-i) bit[x][i] += val;}
      |                                                                    ^
bridge.cpp: In function 'int main()':
bridge.cpp:37:15: warning: unused variable 'sum' [-Wunused-variable]
   37 |   ll tot = 0, sum[2] = {0, 0};
      |               ^~~
bridge.cpp:25:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |  int k, n; m = 0; scanf("%d %d", &k, &n);
      |                   ~~~~~^~~~~~~~~~~~~~~~~
bridge.cpp:29:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |    scanf(" %c %d %c %d", c, p, c+1, p+1); if(p[0] > p[1]) swap(p[0], p[1]);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridge.cpp:40:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |    scanf(" %c %d %c %d", c, p, c+1, p+1); if(p[0] > p[1]) swap(p[0], p[1]);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 18 ms 1880 KB Output is correct
13 Correct 35 ms 3408 KB Output is correct
14 Correct 23 ms 2500 KB Output is correct
15 Correct 19 ms 2140 KB Output is correct
16 Correct 21 ms 2648 KB Output is correct
17 Correct 22 ms 3416 KB Output is correct
18 Correct 26 ms 2908 KB Output is correct
19 Correct 32 ms 3412 KB Output is correct
20 Correct 22 ms 2904 KB Output is correct
21 Correct 29 ms 3160 KB Output is correct

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Runtime error 1 ms 604 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #4
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Runtime error 1 ms 604 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #5
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Runtime error 1 ms 604 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -