I wrote a code to solve this problem “USACO” so my code worked with Standard I/O and the example was correct , but when I switched to File I/O the answer was 1 wich is not correct ! Can anyone explain why is it changing ? Its the exact same code but I used “freopen” function above .
// Sorry for bad english
Please post both your code with and without file I/O here. Make sure to also format them correctly.
Reading from files should not change the output, so maybe something else is causing this to happen.
1 Like
I am having the same issue, and maybe it will help the OP. Standard and file is below:
on USACO IDE: https://ide.usaco.guide/N9OMu-3I9CTfaxEE1DJ
Standard:
// Source: https://usaco.guide/general/io
#include <bits/stdc++.h>
#include
using namespace std;class Person{
public:
int p;
int m;
int t;Person(int pt, int mt, int tt){ p = pt; m = mt; t = tt; }};
// the argument is the input filename without the extension
void setIO(string s) {
freopen((s + “.in”).c_str(), “r”, stdin);
freopen((s + “.out”).c_str(), “w”, stdout);
}int main() {
//setIO(“badmilk”);int n, m, d, s; cin >> n >> m >> d >> s;
vector data;
for(int i = 0 ; i < d; i++){
int a, b, c; cin >> a >> b >> c;
Person temp(a, b ,c);
data.push_back(temp);
}vector<pair<int, int>> sickness;
int firstSick = 999; //Max time is 100
for(int i = 0; i < s; i++){
int a, b; cin >> a >> b;
sickness.push_back(make_pair(a, b));
}//Loop through all people and find perseon who gets sick the quickest;
for(int i = 0; i < s; i++){
firstSick = min(firstSick, sickness[i].second);
//cout << "First sick: " << firstSick << ", Patient time: " << sickness[d].second << endl;
}int cures = 0;
//Run through each milk type
for(int type = 0; type < m; type++){
int milkMakesSick = 0; //Later: if milkMakesSick == total sick people, calculate how many doses
int tempDoses = 0;
bool alreadyCured[1000];//Run through each sick person for(int i = 0; i < s; i++){ //Run through each in data, looking for that person for(int j = 0; j < d; j++){ //If that person (data[j]) drank the type of milk if(data[j].p == type) { //AND they drank it before firstSick if(data[j].t < firstSick && !alreadyCured[j]){ alreadyCured[j] = true; milkMakesSick++; tempDoses++; }else if(!alreadyCured[j]){ //Otherwise if they have not recieved a dose tempDoses++; alreadyCured[j] = true; } } } //Check to see if everyone got sick from milk before time firstSick //if milkMakesSick == total sick people, update how many doses if(milkMakesSick == s){ cures = max(tempDoses, cures); } //cout << "Temp doeses, cures, milkMakesSick " << tempDoses << ", " << cures << ", " << milkMakesSick << endl; }}
cout << cures << endl;
}
File:
// Source: https://usaco.guide/general/io
#include <bits/stdc++.h>
#include
using namespace std;class Person{
public:
int p;
int m;
int t;Person(int pt, int mt, int tt){ p = pt; m = mt; t = tt; }};
// the argument is the input filename without the extension
void setIO(string s) {
freopen((s + “.in”).c_str(), “r”, stdin);
freopen((s + “.out”).c_str(), “w”, stdout);
}int main() {
//setIO(“badmilk”);int n, m, d, s; cin >> n >> m >> d >> s;
vector data;
for(int i = 0 ; i < d; i++){
int a, b, c; cin >> a >> b >> c;
Person temp(a, b ,c);
data.push_back(temp);
}vector<pair<int, int>> sickness;
int firstSick = 999; //Max time is 100
for(int i = 0; i < s; i++){
int a, b; cin >> a >> b;
sickness.push_back(make_pair(a, b));
}//Loop through all people and find perseon who gets sick the quickest;
for(int i = 0; i < s; i++){
firstSick = min(firstSick, sickness[i].second);
//cout << "First sick: " << firstSick << ", Patient time: " << sickness[d].second << endl;
}int cures = 0;
//Run through each milk type
for(int type = 0; type < m; type++){
int milkMakesSick = 0; //Later: if milkMakesSick == total sick people, calculate how many doses
int tempDoses = 0;
bool alreadyCured[1000];//Run through each sick person for(int i = 0; i < s; i++){ //Run through each in data, looking for that person for(int j = 0; j < d; j++){ //If that person (data[j]) drank the type of milk if(data[j].p == type) { //AND they drank it before firstSick if(data[j].t < firstSick && !alreadyCured[j]){ alreadyCured[j] = true; milkMakesSick++; tempDoses++; }else if(!alreadyCured[j]){ //Otherwise if they have not recieved a dose tempDoses++; alreadyCured[j] = true; } } } //Check to see if everyone got sick from milk before time firstSick //if milkMakesSick == total sick people, update how many doses if(milkMakesSick == s){ cures = max(tempDoses, cures); } //cout << "Temp doeses, cures, milkMakesSick " << tempDoses << ", " << cures << ", " << milkMakesSick << endl; }}
cout << cures << endl;
}