Compilare: user.cpp: In function ‘int cb(int, int)’: user.cpp:31:7: warning: unused variable ‘st’ [-Wunused-variable] int st = 0, dr = nrs[poz] - 1, med, last = 0, i; ^ user.cpp:31:34: warning: unused variable ‘med’ [-Wunused-variable] int st = 0, dr = nrs[poz] - 1, med, last = 0, i; ^ user.cpp:31:39: warning: unused variable ‘last’ [-Wunused-variable] int st = 0, dr = nrs[poz] - 1, med, last = 0, i; ^ user.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:41:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spectacole.in", "r", stdin); ^ user.cpp:42:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spectacole.out", "w", stdout); ^ user.cpp:44:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:46:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp:48:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b[i]); ^ user.cpp:50:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &spec[i].sala, &spec[i].x, &spec[i].y); ^ user.cpp:43:26: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, i, j, maxim, nrc, maxc; ^