realjudge.c

/***************************************************************************
    This file is part of Project Lemon
    Copyright (C) 2011 Zhipeng Jia

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
***************************************************************************/

#include <stdio.h>
#include <math.h>

int main(int argc, char *argv[]) {
    FILE *contestantOutputFile = fopen(argv[1], "r");
    if (contestantOutputFile == NULL) {
        printf("Cannot open contestant\'s output file\n");
        return 0;
    }
    FILE *standardOutputFile = fopen(argv[2], "r");
    if (standardOutputFile == NULL) {
        printf("Cannot open standard output file\n");
        fclose(contestantOutputFile);
        return 0;
    }
    
    int realPrecision, i;
    sscanf(argv[3], "%d", &realPrecision);
    double eps = 1;
    for (i = 0; i < realPrecision; i ++)
        eps *= 0.1;
    
    double a, b;
    while (1) {
        int cnt1 = fscanf(contestantOutputFile, "%lf", &a);
        int cnt2 = fscanf(standardOutputFile, "%lf", &b);
        if (cnt1 == 0) {
            printf("Wrong answer\nInvalid characters found\n");
            fclose(contestantOutputFile);
            fclose(standardOutputFile);
            return 0;
        }
        if (cnt2 == 0) {
            printf("Invalid characters in standard output file\n");
            fclose(contestantOutputFile);
            fclose(standardOutputFile);
            return 0;
        }
        if (cnt1 == EOF && cnt2 == EOF) break;
        if (cnt1 == EOF && cnt2 == 1) {
            printf("Wrong answer\nShorter than standard output\n");
            fclose(contestantOutputFile);
            fclose(standardOutputFile);
            return 0;
        }
        if (cnt1 == 1 && cnt2 == EOF) {
            printf("Wrong answer\nLonger than standard output\n");
            fclose(contestantOutputFile);
            fclose(standardOutputFile);
            return 0;
        }
        if (fabs(a - b) > eps) {
			printf("Wrong answer\nRead %.10lf but expect %.10lf\n", a, b);
            fclose(contestantOutputFile);
            fclose(standardOutputFile);
            return 0;
        }
    }
    
    printf("Correct answer\n");
    fclose(contestantOutputFile);
    fclose(standardOutputFile);
    return 0;
}