Submission #1985711

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Source Code Expand

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

int descending_compare(const void *a, const void *b){
    if (*(int*)a > *(int*)b){
        return -1;
    }else if (*(int*)a == *(int*)b){
        return 0;
    }else{
        return 1;
    }
}

int ascending_compare(const void *a, const void *b){
    if (*(int*)a < *(int*)b){
        return -1;
    }else if (*(int*)a == *(int*)b){
        return 0;
    }else{
        return 1;
    }
}


int lower_bound(int *a, int n, int key){
    int left, mid, right;
    left = 0, right = n;
    mid = (left + right)/2;
    while ((left+1 != mid || mid+1 != right) && mid != left){
        if (key > a[mid]){
            left = mid;
        }else{
            right = mid+1;
        }
        mid = (left + right)/2;
    }
    if (a[left] >= key)return left;
    if (a[mid] >= key)return mid;
    if (a[right] >= key)return right;
    return n;
}

//greatest common divisor
unsigned long  gcd(unsigned long x, unsigned long y){
    if (y == 0){ 
        return x;
    }else if (x > y){
        return gcd(y, x % y);
    }else{
        return gcd(x, y % x);
    }
}



long long factorial(int x){
    long long rtn = 1;
    int i;
    for (i = x; i > 1; i--){
        rtn = (rtn*i);
    }
    return rtn;
}

int backwords[1000100];

int main(void){
    int xy[4];
    int j = 0;
    for (int i = 0; i < 4; i++){
        scanf("%d", &xy[i]);
    }
    for (int i = 0; i < xy[3]-xy[1]; i++){
        printf("U");
        backwords[j] = 'U'; 
        j++;
    }
    for (int i = 0; i < xy[2]-xy[0]; i++){
        printf("R");
        backwords[j] = 'R';
        j++;
    }
    for (int i = 0; i < j; i++){
        if (backwords[i] == 'U'){
            printf("D");
        }
        if (backwords[i] == 'R'){
            printf("L");
        }
    }
    printf("L");
    for (int i = 0; i < xy[3]-xy[1]; i++){
        printf("U");
    }
    printf("UR");
    for (int i = 0; i < xy[2]-xy[0]; i++){
        printf("R");
    }
    printf("D");
    printf("R");
    for (int i = 0; i < xy[3]-xy[1]; i++){
        printf("D");
    }
    printf("DL");
    for (int i = 0; i < xy[2]-xy[0]; i++){
        printf("L");
    }
    printf("U\n");



    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:73:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &xy[i]);
                            ^

Judge Result