Compilare: user.cpp: In function ‘int main()’: user.cpp:67:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(--res, i = 0; i < q[res].size(); ++i) COADA[++sf] = q[res][i]; ^ user.cpp:27:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&N,&M); ^ user.cpp:30:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,NMax,fin); ^ user.cpp:44:20: warning: ‘xf’ may be used uninitialized in this function [-Wmaybe-uninitialized] a[xf][yf] = '.'; ^ user.cpp:44:20: warning: ‘yf’ may be used uninitialized in this function [-Wmaybe-uninitialized]