Compilare: main.cpp: In function 'int main()': main.cpp:70:12: warning: statement has no effect [-Wunused-value] ok == true; ~~~^~~~~~~ main.cpp:43:16: warning: unused variable 'j' [-Wunused-variable] int n, q, i, j, k, l, c, xs, ys, xf, yf; ^ main.cpp:46:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &q ); ^ main.cpp:48:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &l, &c ); ^ main.cpp:51:48: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d%d", &xs, &ys, &xf, &yf ); ^