#include <bits/stdc++.h>
#define kyou using
#define mo namespace
#define kawaii std
kyou mo kawaii;
#define ll long long
#define ld long double
#define endl "\n"
const int MX = 100005;
const int LG = (int)log2(MX) + 1;
const int BLOCK = 205;
const int inf = 1000000069;
const ll inf_ll = 8000000000000000069ll;
const ld inf_ld = (ld)inf_ll;
const ld eps = 1e-9;
const ll mod = 1000000007;
const int alpha = 30;
const int dxh[] = {1, 1, -1, -1, 2, 2, -2, -2};
const int dyh[] = {2, -2, 2, -2, 1, -1, 1, -1}; // horse
const int dx[] = {1, -1, 0, 0, 0, 0};
const int dy[] = {0, 0, 1, -1, 0, 0}; // adj
const int dz[] = {0, 0, 0, 0, 1, -1}; // 3d
const int dxd[] = {1, 1, 1, 0, -1, -1, -1, 0};
const int dyd[] = {1, 0, -1, -1, -1, 0, 1, 1}; // diag
mt19937 rng(time(NULL));
bool untied = 0;
void setIn(string s){freopen(s.c_str(), "r", stdin);}
void setOut(string s){freopen(s.c_str(), "w", stdout);}
void unsyncIO(){cin.tie(0) -> sync_with_stdio(0);}
void setIO(string s = ""){
if(!untied) unsyncIO(), untied = 1;
if(s.size()){
setIn(s + ".in");
setOut(s + ".out");
}
}
int mn[MX * 4], mx[MX * 4], lz[MX * 4];
void prop(int nd, int cl, int cr){
if(lz[nd] != 0){
mn[nd] += lz[nd];
mx[nd] += lz[nd];
if(cl != cr){
lz[nd * 2] += lz[nd];
lz[nd * 2 + 1] += lz[nd];
}
lz[nd] = 0;
}
}
void upd(int nd, int cl, int cr, int lf, int rg, int val){
prop(nd, cl, cr);
if(lf > rg || cl > cr || cr < lf || rg < cl) return;
if(lf <= cl && cr <= rg){
lz[nd] += val;
prop(nd, cl, cr);
return;
}
upd(2 * nd, cl, (cl + cr) / 2, lf, rg, val);
upd(2 * nd + 1, (cl + cr) / 2 + 1, cr, lf, rg, val);
mn[nd] = min(mn[2 * nd], mn[2 * nd + 1]);
mx[nd] = max(mx[2 * nd], mx[2 * nd + 1]);
}
int main(){
setIO();
int n; cin >> n;
for(int a, b, i = 0; i < n; i ++){
cin >> a >> b;
upd(1, 1, n, 1, a, 2 * b - 3);
if(mx[1] <= 0) cout << ">\n";
else if(mn[1] >= 0) cout << "<\n";
else cout << "?\n";
}
return 0;
}
Compilation message
stones.cpp: In function 'void setIn(std::string)':
stones.cpp:31:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
31 | void setIn(string s){freopen(s.c_str(), "r", stdin);}
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
stones.cpp: In function 'void setOut(std::string)':
stones.cpp:32:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
32 | void setOut(string s){freopen(s.c_str(), "w", stdout);}
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
1 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
324 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
6 ms |
716 KB |
Output is correct |
| 11 |
Correct |
42 ms |
2532 KB |
Output is correct |
| 12 |
Correct |
71 ms |
4164 KB |
Output is correct |
| 13 |
Correct |
57 ms |
4308 KB |
Output is correct |
| 14 |
Correct |
57 ms |
4280 KB |
Output is correct |
| 15 |
Correct |
59 ms |
4256 KB |
Output is correct |
| 16 |
Correct |
57 ms |
4264 KB |
Output is correct |
| 17 |
Correct |
56 ms |
4252 KB |
Output is correct |
| 18 |
Correct |
62 ms |
4292 KB |
Output is correct |
| 19 |
Correct |
57 ms |
4368 KB |
Output is correct |
| 20 |
Correct |
57 ms |
4264 KB |
Output is correct |
| 21 |
Correct |
57 ms |
4316 KB |
Output is correct |
| 22 |
Correct |
59 ms |
4412 KB |
Output is correct |
| 23 |
Correct |
57 ms |
4364 KB |
Output is correct |
| 24 |
Correct |
58 ms |
4300 KB |
Output is correct |
| 25 |
Correct |
57 ms |
4292 KB |
Output is correct |
