Compilare: main.cpp: In function 'int main()': main.cpp:30:11: warning: unused variable 'k' [-Wunused-variable] int i, j, k; ^ main.cpp:57:13: warning: unused variable 'i1' [-Wunused-variable] int nr = 0, i1, j1; ^~ main.cpp:57:17: warning: unused variable 'j1' [-Wunused-variable] int nr = 0, i1, j1; ^~ main.cpp:26:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nrtri.in", "r", stdin); ^ main.cpp:27:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nrtri.out", "w", stdout); ^ main.cpp:31:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:33:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^