Compilare: main.cpp: In function 'int main()': main.cpp:81:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d\n",&N,&M,&Q); ^ main.cpp:83:31: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(C[i] + 1,1005,f); ^ main.cpp:90:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&x,&y,&xx,&yy); ^