Compilare: user.cpp: In function ‘int main()’: user.cpp:75:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<wall[w].size()&&!(wall[w][i].lin==l&&wall[w][i].col==c)) ^ user.cpp:77:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<wall[w].size()){ ^ user.cpp:14:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:15:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d " ,&l,&c,&dir); ^ user.cpp:19:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&mat[i][j]); ^ user.cpp:27:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&t); ^ user.cpp:30:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&x,&y); ^