Rezumat problemă

matprod

#4024

Se consideră o matrice pătratică A=(ai,j)de ordin n, elementele sale fiind cifre în baza 10. Pentru fiecare element ai,j al matricei definim drumul de la elementul a1,1 la elementul ai,j ca fiind format din elementele: a1,1, a2,1, …, ai,1, ai,2, ai,3, …, ai,j. Pentru fiecare element ai,j al matricei, se cere să se calculeze suma produselor oricăror două elemente situate pe drumul de la elementul a1,1 la elementul ai,j.

Fișiere Bunget Mihai (mihaibun) Mihai Bunget medie

Clasa 9 Tablouri bidimensionale (matrice) Parcurgerea matricelor pătratice

Rezolvă

Detalii

Problema	matprod	Operații I/O	matprod.in/matprod.out
Limita timp	0.5 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#64347013	Utilizator	Poienariu Maria (_n4tty_)
Fișier	matprod.c	Dimensiune	1.59 KB
Data încărcării	30 Aprilie 2026, 20:25	Scor/rezultat	Eroare de compilare

Evaluare

Mesaj compilare

matprod.c: In function ‘main’:
matprod.c:15:5: error: unknown type name ‘FILE’
   15 |     FILE *fin = fopen("matprod.in", "r");
      |     ^~~~
matprod.c:1:1: note: ‘FILE’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
  +++ |+#include <stdio.h>
    1 | /******************************************************************************
matprod.c:15:17: warning: implicit declaration of function ‘fopen’ [-Wimplicit-function-declaration]
   15 |     FILE *fin = fopen("matprod.in", "r");
      |                 ^~~~~
matprod.c:15:17: note: ‘fopen’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
matprod.c:15:17: warning: initialization of ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
matprod.c:16:5: error: unknown type name ‘FILE’
   16 |     FILE *fout = fopen("matprod.out", "w");
      |     ^~~~
matprod.c:16:5: note: ‘FILE’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
matprod.c:16:18: warning: initialization of ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   16 |     FILE *fout = fopen("matprod.out", "w");
      |                  ^~~~~
matprod.c:20:9: warning: implicit declaration of function ‘fscanf’ [-Wimplicit-function-declaration]
   20 |     if (fscanf(fin, "%d", &n) != 1) return 0;
      |         ^~~~~~
matprod.c:20:9: note: include ‘<stdio.h>’ or provide a declaration of ‘fscanf’
matprod.c:20:9: warning: incompatible implicit declaration of built-in function ‘fscanf’ [-Wbuiltin-declaration-mismatch]
matprod.c:20:9: note: include ‘<stdio.h>’ or provide a declaration of ‘fscanf’
matprod.c:24:13: warning: incompatible implicit declaration of built-in function ‘fscanf’ [-Wbuiltin-declaration-mismatch]
   24 |             fscanf(fin, "%d", &a[i][j]);
      |             ^~~~~~
matprod.c:24:13: note: include ‘<stdio.h>’ or provide a declaration of ‘fscanf’
matprod.c:48:13: warning: implicit declaration of function ‘fprintf’ [-Wimplicit-function-declaration]
   48 |             fprintf(fout, "%lld ", rez);
      |             ^~~~~~~
matprod.c:48:13: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
matprod.c:48:13: warning: incompatible implicit declaration of built-in function ‘fprintf’ [-Wbuiltin-declaration-mismatch]
matprod.c:48:13: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
matprod.c:50:9: warning: incompatible implicit declaration of built-in function ‘fprintf’ [-Wbuiltin-declaration-mismatch]
   50 |         fprintf(fout, "\n");
      |         ^~~~~~~
matprod.c:50:9: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
matprod.c:53:5: warning: implicit declaration of function ‘fclose’ [-Wimplicit-function-declaration]
   53 |     fclose(fin);
      |     ^~~~~~

Cum funcționează evaluarea?