Submission #95562

#	Time	Username	Problem	Language	Result	Execution time	Memory
95562		oolimry	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	1350 ms	144868 KiB

Main

#include <bits/stdc++.h>
using namespace std;
inline int readInt() {
    int x = 0;
    char ch = getchar();
    while (ch < '0' || ch > '9') ch = getchar();
    while (ch >= '0' && ch <= '9'){
		x = (x << 3) + (x << 1) + ch - '0';
		ch = getchar();
	}
    return x;
}


int X[10000000], Y[10000000];
bool in(int a, int b){
    /// if b is under a, return true
    int x1 = X[a];
    int x2 = X[b];
    int y1 = Y[a];
    int y2 = Y[b];
    return abs(x1 - x2) <= y1 - y2;
}
int main(){
    //freopen("i.txt.txt","r",stdin);
	int n = readInt();
	for(int i = 0; i < n; i++) {
		X[i] = readInt();
		Y[i] = readInt();
		// write code here
	}
	// write code here
	//for(int i  = 0;i < n;i++){
        //printf("%d %d\n",X[i],Y[i]);
	//}

	stack<int> s;

	if(in(2,3)){
        //printf("yes");
	}
	for(int i = 0;i < n;i++){
        if(s.empty()){
            s.push(i);
            continue;
        }

        else if(in(s.top(),i)){
            continue;
        }

        else if(in(i,s.top())){
            while(!s.empty() && in(i,s.top())){
                s.pop();
            }
            s.push(i);
        }

        else{
            s.push(i);
        }
	}

	printf("%d",s.size());
	return 0;
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:64:22: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::stack<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d",s.size());
              ~~~~~~~~^

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 20 / 20