Compilare: main.cpp: In function 'int main()': main.cpp:15:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &n ); ^ main.cpp:17:58: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d%d", &v[i].first, &v[i].second ); ^ main.cpp:12:64: warning: 'lmax1' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, stmax = 0, stmin = 0, drmax = -1, drmin = -1, j, l, lmax1, lmax2; ^~~~~ main.cpp:12:71: warning: 'lmax2' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, stmax = 0, stmin = 0, drmax = -1, drmin = -1, j, l, lmax1, lmax2; ^~~~~ main.cpp:41:15: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] l = i - j + 1; ~~^~~