Compilare: main.cpp: In function 'int main()': main.cpp:20:45: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d%d", &n, &m, &x, &t ) ; ^ main.cpp:23:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &mat[i][j] ) ; ^ main.cpp:19:19: warning: 'kmin' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, x, t, kmin, k, i, j1, j2, j, minim, s ; ^~~~