Submission #61442

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
61442	2018-07-26T03:40:40 Z	ainta(#1774)	Election (BOI18_election)	C++11	Compilation error	0 ms	0 KB

election

#include<cstdio>
#include<algorithm>
#include<vector>
#define N_ 501000
#define SZ 524288
using namespace std;
struct Tree {
	int L, R, S;
}IT[SZ + SZ];
int n;
char p[N_];
Tree Merge(Tree &a, Tree &b) {
	return { max(a.L,a.S + b.L), max(b.R,b.S + a.R),a.S + b.S };
}
void Put(int a, int b) {
	a += SZ;
	IT[a].L = IT[a].R = max(b, 0);
	IT[a].S = b;
	while (a != 1) {
		a >>= 1;
		IT[a] = Merge(IT[a * 2], IT[a * 2 + 1]);
	}
}
Tree Calc(int nd, int b, int e, int s, int l) {
	if (s > l)return { 0,0,0 };
	if (b == s&&e == l)return IT[nd];
	int m = (b + e) >> 1;
	if (s <= m && l > m){
		return Merge(Calc(nd * 2, b, m, s, min(m, l)), Calc(nd * 2 + 1, m + 1, e, max(m + 1, s), l));
	}
	if (s <= m)return Calc(nd * 2, b, m, s, min(m, l));
	if (l > m)return Calc(nd * 2 + 1, m + 1, e, max(m + 1, s), l);
}
int main() {
	int i;
	
	scanf("%d", &n);
	scanf("%s", p + 1);
	for (i = 1; i <= n; i++) {
		if (p[i] == 'C')Put(i, -1);
		else Put(i, 1);
	}
	int Q;
	scanf("%d", &Q);
	while (Q--) {
		int b, e;
		scanf("%d%d", &b, &e);
		Tree tt = Calc(1, 0, SZ-1, b, e);
		printf("%d\n", max(tt.L, tt.R));
	}
}

Compilation message

election.cpp: In function 'Tree Calc(int, int, int, int, int)':
election.cpp:29:20: error: cannot bind non-const lvalue reference of type 'Tree&' to an rvalue of type 'Tree'
   return Merge(Calc(nd * 2, b, m, s, min(m, l)), Calc(nd * 2 + 1, m + 1, e, max(m + 1, s), l));
                ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:12:6: note:   initializing argument 1 of 'Tree Merge(Tree&, Tree&)'
 Tree Merge(Tree &a, Tree &b) {
      ^~~~~
election.cpp: In function 'int main()':
election.cpp:37:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
election.cpp:38:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", p + 1);
  ~~~~~^~~~~~~~~~~~~
election.cpp:44:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &Q);
  ~~~~~^~~~~~~~~~
election.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &b, &e);
   ~~~~~^~~~~~~~~~~~~~~~