Submission #407212

#	Time	Username	Problem	Language	Result	Execution time	Memory
407212		LptN21	Topovi (COCI15_topovi)	C++14	120 / 120	1247 ms	33648 KiB

topovi

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
#define FF first
#define SS second
#define pb push_back
#define sz(x) (int)x.size()
#define oo 1e9
#define eps 1e-9
#define PI acos(-1.0)
#define lb lower_bound
#define ub upper_bound
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
const int N = 1e5+7, M=13+7;
const int MOD = 1e9+7;

int n, m, k, t;
ll ans=0;
map<int, int> rx, cx;
map<int, int> slr, slc;
map<ii, int> rook;

void mv(int r, int c, int v) {
    ans-=t-slr[cx[c]], ans-=t-slc[rx[r]];
    if(rx[r]!=cx[c]) ans+=1;
    slr[rx[r]]--, slc[cx[c]]--;
    rx[r]^=v, cx[c]^=v;
    slr[rx[r]]++, slc[cx[c]]++;
    ans+=t-slr[cx[c]], ans+=t-slc[rx[r]];
    if(rx[r]!=cx[c]) ans-=1;
    rook[ii(r, c)]^=v;
}

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    //fastIO;
    scanf("%d%d%d", &t, &n, &m);
    int x, y, u, v;slr[0]=slc[0]=t;
    for(int i=1;i<=n;i++) {
        scanf("%d%d%d", &x, &y, &k);
        mv(x, y, k);
    }
    for(int w, i=1;i<=m;i++) {
        scanf("%d%d%d%d", &x, &y, &u, &v);
        w=rook[ii(x, y)];
        mv(x, y, w), mv(u, v, w);
        printf("%lld\n", ans);
    }
    return 0;
}
/* stuff you should look for
    - int overflow, array bounds
    - special cases (n=1?)
    - do smth instead of do nothing and stay organized
    - WRITE STUFF DOWN
    - DONT JUST STICK ON ONE APPROACH
*/

Compilation message (stderr)

topovi.cpp: In function 'int main()':
topovi.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |     scanf("%d%d%d", &t, &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
topovi.cpp:43:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |         scanf("%d%d%d", &x, &y, &k);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
topovi.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         scanf("%d%d%d%d", &x, &y, &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 120 / 120