Compilare: user.cpp: In function ‘int main()’: user.cpp:52:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, p, q, c, L, R; ^ user.cpp:52:15: warning: unused variable ‘p’ [-Wunused-variable] int i, j, p, q, c, L, R; ^ user.cpp:52:18: warning: unused variable ‘q’ [-Wunused-variable] int i, j, p, q, c, L, R; ^ user.cpp:52:21: warning: unused variable ‘c’ [-Wunused-variable] int i, j, p, q, c, L, R; ^ user.cpp: In function ‘int cmp(Stalpi, Stalpi)’: user.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:53:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d\n", &N); ^ user.cpp:56:75: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d %d %d %d\n", &P[i].x, &P[i].c, &P[i].st, &P[i].dr); ^