Submission #1222027

#	Time	Username	Problem	Language	Result	Execution time	Memory
1222027		TVSown	Dreaming (IOI13_dreaming)	C++20	Compilation error	0 ms	0 KiB

dreaming

///*** Sown_Vipro ***///
/// ->TEAM SELECTION TEST<- ///

#include<bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("popcnt")
#define F first
#define S second
#define pb push_back
#define pi pair<int, int>
#define pii pair<int, pair<int, int> >
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define REP(i, a, b) for(int i = a; i >= b; --i)
#define all(s) s.begin(), s.end()
#define szz(s) int(s.size())
const string NAME = "sown";
const int N = 1e6 + 5, MAX = 1e6, oo = 1e9 + 5, MOD = 1e9 + 7;
void maxi(int &x, int y){ if(x < y) x = y; }
void mini(int &x, int y){ if(x > y) x = y; };
void add(int &x, int y){ x += y; x += MOD * (x < 0); x -= MOD * (x >= MOD); };
int n, m, l;
vector<pi> e[N];

int mx1, mx2, mi;
int in[N], in2[N], out[N], vst[N];

void dfs(int u, int p){
    vst[u] = 1;
    for(auto [v, w] : e[u]){
        if(v == p) continue;
        dfs(v, u);
        if(in[v] + w > in[u]){
            in2[u] = in[u];
            in[u] = in[v] + w;
        }else if(in[v] + w > in2[u]){
            in2[u] = in[v] + w;
        }
    }
}

void dfs2(int u, int p){
//    cout << u << " " << in[u] << " " << out[u] << "\n";

    mi = min(mi, in[u] + out[u]);


    for(auto [v, w] : e[u]){
        if(v == p) continue;
        out[v] = out[u] + w;
        if(in[v] + w == in[u]) out[v] = max(out[v], in2[u] + w);
        else out[v] = max(out[v], in[u] + w);

        dfs2(v, u);
    }
}

void solve(){
    cin >> n >> m >> l;
    FOR(i, 1, m){
        int u, v, w; cin >> u >> v >> w;
        e[u].pb({v, w});
        e[v].pb({u, w});
    }

    FOR(u, 1, n){
        if(!vst[u]){
            dfs(u, 0);
            mi = oo;
            dfs2(u, 0);
            if(mi > mx1){
                mx2 = mx1;
                mx1 = mi;
            }else if(mi > mx2){
                mx2 = mi;
            }
        }
    }
    cout << mx1 + mx2 + l * (mx2 > 0);
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    if(fopen((NAME + ".inp").c_str(), "r")){
        freopen((NAME + ".inp").c_str(), "r", stdin);
//        freopen((NAME + ".out").c_str(), "w", stdout);
    }
    int t = 1;
//    cin >> t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

dreaming.cpp: In function 'int main()':
dreaming.cpp:87:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |         freopen((NAME + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccX0tt7Q.o: in function `main':
grader.c:(.text.startup+0x0): multiple definition of `main'; /tmp/ccfCpX7F.o:dreaming.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccX0tt7Q.o: in function `main':
grader.c:(.text.startup+0xc4): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status