Compilare: main.cpp: In function 'int main()': main.cpp:67:78: warning: unused variable 'j' [-Wunused-variable] int n, m, linstart, colstart, linfinish, colfinish, lincopac, colcopac, i, j; ^ main.cpp:70:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ main.cpp:72:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &lincopac, &colcopac); ^ main.cpp:75:72: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &linstart, &colstart, &linfinish, &colfinish); ^