Submission #403120

#	Time	Username	Problem	Language	Result	Execution time	Memory
403120		fidgetspinnerkid	Traffic (IOI10_traffic)	C++11	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h> // see /general/running-code-locally
using namespace std;

using ll = long long;

using vi = vector<int>;
#define pb push_back
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

using pi = pair<int,int>;
#define f first
#define s second
#define mp make_pair

void setIO(string name = "") {
	cin.tie(0)->sync_with_stdio(0); // see /general/fast-io
	if (sz(name)) {
		freopen((name+".in").c_str(), "r", stdin); // see /general/io
		freopen((name+".out").c_str(), "w", stdout);
	}
}

const int SZ = 1000;
int n;

vector<int> adjlist[SZ];
int p[SZ];
int pref[SZ+1];

void fill_pref() {
    for(int i=0; i<n; i++) {
        pref[i+1] = pref[i] + p[i];
    }
}

int main() {
    setIO();
    cin >> n;
    for(int i=0; i<n; i++) {
        int x;
        cin >> x;
        p[i] = x;
    }
    for(int i=0; i<n-1; i++) {
        int x, y;
        cin >> x >> y;
        adjlist[x-1].push_back(y-1);
        adjlist[y-1].push_back(x-1);
    }

    fill_pref();
    
    int sol = 0;
    int min_cong = 2000000001;
    for(int i=0; i<n; i++) {
        int s = max(pref[i], pref[n-1]-pref[i+1]);
        if(min_cong>s) {
            min_cong = s;
            sol = i;
        }
    }

}

Compilation message (stderr)

traffic.cpp: In function 'int main()':
traffic.cpp:54:9: warning: variable 'sol' set but not used [-Wunused-but-set-variable]
   54 |     int sol = 0;
      |         ^~~
traffic.cpp: In function 'void setIO(std::string)':
traffic.cpp:19:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   freopen((name+".in").c_str(), "r", stdin); // see /general/io
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
traffic.cpp:20:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |   freopen((name+".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccOnAMtd.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccgNjbjg.o:traffic.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccOnAMtd.o: in function `main':
grader.cpp:(.text.startup+0xe1): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status