Compilare: user.cpp: In function ‘int main()’: user.cpp:54:9: warning: unused variable ‘x0’ [-Wunused-variable] int x0, y0, x2, y2, ansl, ansc, x3, y3; ^ user.cpp:54:13: warning: unused variable ‘y0’ [-Wunused-variable] int x0, y0, x2, y2, ansl, ansc, x3, y3; ^ user.cpp:54:37: warning: unused variable ‘x3’ [-Wunused-variable] int x0, y0, x2, y2, ansl, ansc, x3, y3; ^ user.cpp:54:41: warning: unused variable ‘y3’ [-Wunused-variable] int x0, y0, x2, y2, ansl, ansc, x3, y3; ^ user.cpp:56:10: warning: unused variable ‘flag’ [-Wunused-variable] bool flag, flag2; ^ user.cpp:56:16: warning: unused variable ‘flag2’ [-Wunused-variable] bool flag, flag2; ^ user.cpp:25:21: warning: unused variable ‘crmax’ [-Wunused-variable] int t, ans, x, y, crmax, max; ^ user.cpp:27:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &t, &n, &m); ^ user.cpp:31:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &a[i][j]); ^ user.cpp:90:48: warning: ‘ansch’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(f, "%d %d\n%c\n", ansl, ansc, ansch); ^ user.cpp:25:10: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] int t, ans, x, y, crmax, max; ^