Time Limit Exceeded

Question

I wrote the code below to solve the problem 1112 from the site Urionlinejudge and apparently the logic employed is perfect, but I’m getting an error of time exceeded. I’m having trouble identifying the error. It appears to be in the first scanf(), since when I run the program I can type an endless sequence of 0’s and spaces that the program will only return zero and end when the ENTER key is pressed, but I don’t know what to do for it, when you read 3 consecutive zeroes in the first entry, now close. I believe that it is necessary that, when reading these three data, even without pressing the ENTER key, the program already closes if there are three zeros.

#include <stdio.h>

int main (){
    int X, Y, P, Q;
    int i, j, k, l;
    char carac;
    while(1){
        scanf("%d %d %d", &X, &Y, &P);
        if(X==0 && Y==0 && P==0){
            return 0;
        }
        int campo[X][Y];
        for(i=0;i<X;i++){
            for(j=0;j<Y;j++){
                campo[i][j]=0;
            }
        }
        scanf("%d", &Q);
        int N=0, Z, W, qtd;
        for(i=0;i<Q;i++){
            qtd=0;
            scanf(" %c", &carac);
            if(carac=='A'){
                scanf("%d %d %d", &N, &X, &Y);
                campo[X][Y]+=N;
            }
            else{
                scanf("%d %d %d %d", &X, &Y, &Z, &W);
                for(j=X;j<=Z;j++){
                    if(Y>W){
                        l=Y;
                        Y=W;
                        W=l;
                    }
                    for(k=Y;k<=W;k++){
                        qtd+=campo[j][k];
                    }
                }
                printf("%d\n", qtd*P);
            }
        }
    }
}

Answer 1

Checks the amount returned by scanf()

        if (scanf("%d%d%d", &X, &Y, &P) != 3) exit(EXIT_FAILURE);

        if (scanf("%d", &Q) != 1) exit(EXIT_FAILURE);

            if (scanf(" %c", &carac) != 1) exit(EXIT_FAILURE);

                if (scanf("%d%d%d", &N, &X, &Y) != 3) exit(EXIT_FAILURE);

                if (scanf("%d%d%d%d", &X, &Y, &Z, &W) != 4) exit(EXIT_FAILURE);

Before the exit(EXIT_FAILURE) can send an informative message to stderr, for example: fprintf(stderr, "Erro de input na linha %d\n", __LINE__);